{
 "_meta": {
  "title": "Coin Pinger coin resonance reference",
  "description": "Physics-computed acoustic ping-test references (free-disc c0d2/c0d3/c0d4 resonance modes) plus cited official specifications for gold and silver bullion coins.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Coin Pinger — coinpinger.com",
  "version": "2026-07-24",
  "methodology": "https://coinpinger.com/methodology",
  "note": "All resonance values are COMPUTED from first-principles free circular-plate physics (Leissa eigenvalues, rim and thick-plate corrections) using the cited mint mass and diameter — they are not measurements of sample coins. Tolerances are fractional (±). Modes above 20 kHz are omitted.",
  "coins": 68
 },
 "coins": [
  {
   "name": "Austrian 100 Corona",
   "slug": "austrian-100-corona",
   "metal": "gold",
   "fineness": ".900 gold (90%)",
   "mint": "Austrian Mint (restrike)",
   "mint_source": "https://www.moneymetals.com/austrian-100-corona-gold/125",
   "weight_g": 33.875,
   "diameter_mm": 37,
   "thickness_mm": 2.3,
   "c0d2_hz": 2845,
   "c0d3_hz": 6575,
   "c0d4_hz": 11515,
   "tolerance_c0d2": 0.115,
   "tolerance_c0d3": 0.111,
   "tolerance_c0d4": 0.111,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/austrian-100-corona"
  },
  {
   "name": "Barber Dime (1892–1916)",
   "slug": "barber-dime-1892-1916",
   "metal": "silver",
   "fineness": ".900 silver (90%)",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Barber_coinage",
   "weight_g": 2.5,
   "diameter_mm": 17.91,
   "thickness_mm": null,
   "c0d2_hz": 8310,
   "c0d3_hz": 19190,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.111,
   "tolerance_c0d3": 0.107,
   "tolerance_c0d4": null,
   "confidence": "high",
   "guide_url": "https://coinpinger.com/coins/barber-dime-1892-1916"
  },
  {
   "name": "Barber Half Dollar (1892–1915)",
   "slug": "barber-half-dollar-1892-1915",
   "metal": "silver",
   "fineness": ".900 silver (90%)",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Barber_coinage",
   "weight_g": 12.5,
   "diameter_mm": 30.6,
   "thickness_mm": 1.8,
   "c0d2_hz": 4875,
   "c0d3_hz": 11260,
   "c0d4_hz": 19670,
   "tolerance_c0d2": 0.111,
   "tolerance_c0d3": 0.107,
   "tolerance_c0d4": 0.107,
   "confidence": "high",
   "guide_url": "https://coinpinger.com/coins/barber-half-dollar-1892-1915"
  },
  {
   "name": "Barber Quarter (1892–1916)",
   "slug": "barber-quarter-1892-1916",
   "metal": "silver",
   "fineness": ".900 silver (90%)",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Barber_coinage",
   "weight_g": 6.25,
   "diameter_mm": 24.26,
   "thickness_mm": null,
   "c0d2_hz": 6170,
   "c0d3_hz": 14250,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.111,
   "tolerance_c0d3": 0.107,
   "tolerance_c0d4": null,
   "confidence": "high",
   "guide_url": "https://coinpinger.com/coins/barber-quarter-1892-1916"
  },
  {
   "name": "Franklin Half Dollar",
   "slug": "franklin-half-dollar",
   "metal": "silver",
   "fineness": ".900 silver (90%)",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Franklin_half_dollar",
   "weight_g": 12.5,
   "diameter_mm": 30.6,
   "thickness_mm": 1.8,
   "c0d2_hz": 4875,
   "c0d3_hz": 11260,
   "c0d4_hz": 19670,
   "tolerance_c0d2": 0.111,
   "tolerance_c0d3": 0.107,
   "tolerance_c0d4": 0.107,
   "confidence": "high",
   "guide_url": "https://coinpinger.com/coins/franklin-half-dollar"
  },
  {
   "name": "Gold American Eagle 1 oz",
   "slug": "gold-american-eagle-1-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "United States Mint",
   "mint_source": "https://www.usmint.gov/learn/coins-and-medals/collectible-coins/american-eagle/gold-proof",
   "weight_g": 33.931,
   "diameter_mm": 32.7,
   "thickness_mm": 2.87,
   "c0d2_hz": 4670,
   "c0d3_hz": 10720,
   "c0d4_hz": 18585,
   "tolerance_c0d2": 0.071,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": 0.065,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-american-eagle-1-oz"
  },
  {
   "name": "Gold American Eagle 1/10 oz",
   "slug": "gold-american-eagle-1-10-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "United States Mint",
   "mint_source": "https://www.usmint.gov/learn/coins-and-medals/collectible-coins/american-eagle/gold-proof",
   "weight_g": 3.393,
   "diameter_mm": 16.5,
   "thickness_mm": 1.19,
   "c0d2_hz": 7200,
   "c0d3_hz": 16630,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.072,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-american-eagle-1-10-oz"
  },
  {
   "name": "Gold American Eagle 1/2 oz",
   "slug": "gold-american-eagle-1-2-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "United States Mint",
   "mint_source": "https://www.usmint.gov/learn/coins-and-medals/collectible-coins/american-eagle/gold-proof",
   "weight_g": 16.966,
   "diameter_mm": 27,
   "thickness_mm": 2.24,
   "c0d2_hz": 5020,
   "c0d3_hz": 11565,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.071,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-american-eagle-1-2-oz"
  },
  {
   "name": "Gold American Eagle 1/4 oz",
   "slug": "gold-american-eagle-1-4-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "United States Mint",
   "mint_source": "https://www.usmint.gov/learn/coins-and-medals/collectible-coins/american-eagle/gold-proof",
   "weight_g": 8.483,
   "diameter_mm": 22,
   "thickness_mm": 1.83,
   "c0d2_hz": 5695,
   "c0d3_hz": 13140,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.072,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-american-eagle-1-4-oz"
  },
  {
   "name": "Gold APMEX Round 1/4 oz",
   "slug": "gold-apmex-round-1-4-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "private mint (APMEX round)",
   "mint_source": "https://www.apmex.com/category/19370/1-4-oz-gold-bars-rounds",
   "weight_g": 7.776,
   "diameter_mm": 21.7,
   "thickness_mm": null,
   "c0d2_hz": 4645,
   "c0d3_hz": 10740,
   "c0d4_hz": 18785,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.086,
   "tolerance_c0d4": 0.086,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-apmex-round-1-4-oz"
  },
  {
   "name": "Gold Azadi",
   "slug": "gold-azadi",
   "metal": "gold",
   "fineness": ".900 gold (21.6k)",
   "mint": "Central Bank of Iran",
   "mint_source": "https://en.wikipedia.org/wiki/Bahar_Azadi_Coin",
   "weight_g": 8.13,
   "diameter_mm": 22,
   "thickness_mm": null,
   "c0d2_hz": 5460,
   "c0d3_hz": 12605,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.072,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-azadi"
  },
  {
   "name": "Gold Britannia 1 oz",
   "slug": "gold-britannia-1-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold (2013+)",
   "mint": "The Royal Mint",
   "mint_source": "https://www.royalmint.com/invest/bullion/bullion-coins/gold-coins/",
   "weight_g": 31.104,
   "diameter_mm": 32.69,
   "thickness_mm": null,
   "c0d2_hz": 3610,
   "c0d3_hz": 8320,
   "c0d4_hz": 14500,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.085,
   "tolerance_c0d4": 0.085,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-oz"
  },
  {
   "name": "Gold Britannia 1 oz (1987–2012)",
   "slug": "gold-britannia-1-oz-1987-2012",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "The Royal Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Britannia_(coin)",
   "weight_g": 34.05,
   "diameter_mm": 32.69,
   "thickness_mm": null,
   "c0d2_hz": 4690,
   "c0d3_hz": 10770,
   "c0d4_hz": 18665,
   "tolerance_c0d2": 0.071,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": 0.065,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-oz-1987-2012"
  },
  {
   "name": "Gold Britannia 1 oz (2013–2025)",
   "slug": "gold-britannia-1-oz-2013-2025",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "The Royal Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Britannia_(coin)",
   "weight_g": 31.104,
   "diameter_mm": 32.69,
   "thickness_mm": 2.3,
   "c0d2_hz": 3610,
   "c0d3_hz": 8320,
   "c0d4_hz": 14500,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.085,
   "tolerance_c0d4": 0.085,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-oz-2013-2025"
  },
  {
   "name": "Gold Britannia 1/10 oz",
   "slug": "gold-britannia-1-10-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "The Royal Mint",
   "mint_source": "https://www.royalmint.com/invest/bullion/bullion-coins/gold-coins/bb26gxc-britannia-2026-tenth-oz-gold-bullion-coin/",
   "weight_g": 3.13,
   "diameter_mm": 16.5,
   "thickness_mm": null,
   "c0d2_hz": 5595,
   "c0d3_hz": 12945,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.086,
   "tolerance_c0d4": null,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-10-oz"
  },
  {
   "name": "Gold Britannia 1/2 oz",
   "slug": "gold-britannia-1-2-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "The Royal Mint",
   "mint_source": "https://www.royalmint.com/invest/bullion/bullion-coins/gold-coins/bb26ghc-britannia-2026-1-2-oz-gold-bullion-coin/",
   "weight_g": 15.6,
   "diameter_mm": 27,
   "thickness_mm": null,
   "c0d2_hz": 3890,
   "c0d3_hz": 8985,
   "c0d4_hz": 15705,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.086,
   "tolerance_c0d4": 0.086,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-2-oz"
  },
  {
   "name": "Gold Britannia 1/4 oz",
   "slug": "gold-britannia-1-4-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "The Royal Mint",
   "mint_source": "https://www.royalmint.com/invest/bullion/bullion-coins/gold-coins/bb26gqc-britannia-2026-quarter-oz-gold-bullion-coin/",
   "weight_g": 7.78,
   "diameter_mm": 22,
   "thickness_mm": null,
   "c0d2_hz": 4400,
   "c0d3_hz": 10175,
   "c0d4_hz": 17815,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.086,
   "tolerance_c0d4": 0.086,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-britannia-1-4-oz"
  },
  {
   "name": "Gold Buffalo 1 oz",
   "slug": "gold-buffalo-1-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/American_Buffalo_(coin)",
   "weight_g": 31.108,
   "diameter_mm": 32.7,
   "thickness_mm": 2.95,
   "c0d2_hz": 3605,
   "c0d3_hz": 8310,
   "c0d4_hz": 14485,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.085,
   "tolerance_c0d4": 0.085,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-buffalo-1-oz"
  },
  {
   "name": "Gold Double Eagle $20",
   "slug": "gold-double-eagle-20",
   "metal": "gold",
   "fineness": ".900 gold (90%)",
   "mint": "United States Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Saint-Gaudens_double_eagle",
   "weight_g": 33.436,
   "diameter_mm": 34,
   "thickness_mm": 2.41,
   "c0d2_hz": 3935,
   "c0d3_hz": 9070,
   "c0d4_hz": 15790,
   "tolerance_c0d2": 0.115,
   "tolerance_c0d3": 0.111,
   "tolerance_c0d4": 0.111,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-double-eagle-20"
  },
  {
   "name": "Gold Kangaroo 1 oz",
   "slug": "gold-kangaroo-1-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "Perth Mint",
   "mint_source": "https://www.perthmint.com/shop/bullion/bullion-coins/",
   "weight_g": 31.103,
   "diameter_mm": 32.6,
   "thickness_mm": null,
   "c0d2_hz": 3650,
   "c0d3_hz": 8410,
   "c0d4_hz": 14655,
   "tolerance_c0d2": 0.106,
   "tolerance_c0d3": 0.102,
   "tolerance_c0d4": 0.102,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-kangaroo-1-oz"
  },
  {
   "name": "Gold Kangaroo 1/10 oz",
   "slug": "gold-kangaroo-1-10-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "Perth Mint",
   "mint_source": "https://www.perthmint.com/shop/bullion/bullion-coins/australian-kangaroo-2026-1-10oz-gold-bullion-coin/",
   "weight_g": 3.111,
   "diameter_mm": 16.6,
   "thickness_mm": null,
   "c0d2_hz": 5425,
   "c0d3_hz": 12565,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.106,
   "tolerance_c0d3": 0.102,
   "tolerance_c0d4": null,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-kangaroo-1-10-oz"
  },
  {
   "name": "Gold Kangaroo 1/2 oz",
   "slug": "gold-kangaroo-1-2-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "Perth Mint",
   "mint_source": "https://www.perthmint.com/shop/bullion/bullion-coins/",
   "weight_g": 15.552,
   "diameter_mm": 25.6,
   "thickness_mm": null,
   "c0d2_hz": 4795,
   "c0d3_hz": 11050,
   "c0d4_hz": 19240,
   "tolerance_c0d2": 0.106,
   "tolerance_c0d3": 0.102,
   "tolerance_c0d4": 0.102,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-kangaroo-1-2-oz"
  },
  {
   "name": "Gold Kangaroo 1/4 oz",
   "slug": "gold-kangaroo-1-4-oz",
   "metal": "gold",
   "fineness": ".9999 fine gold",
   "mint": "Perth Mint",
   "mint_source": "https://www.perthmint.com/shop/bullion/bullion-coins/australian-kangaroo-2023-1-4oz-gold-bullion-coin/",
   "weight_g": 7.777,
   "diameter_mm": 20.6,
   "thickness_mm": null,
   "c0d2_hz": 5720,
   "c0d3_hz": 13190,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.106,
   "tolerance_c0d3": 0.102,
   "tolerance_c0d4": null,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-kangaroo-1-4-oz"
  },
  {
   "name": "Gold Krugerrand 1 oz",
   "slug": "gold-krugerrand-1-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "Rand Refinery / South African Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Krugerrand",
   "weight_g": 33.93,
   "diameter_mm": 32.77,
   "thickness_mm": 2.84,
   "c0d2_hz": 4630,
   "c0d3_hz": 10630,
   "c0d4_hz": 18435,
   "tolerance_c0d2": 0.071,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": 0.065,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-krugerrand-1-oz"
  },
  {
   "name": "Gold Krugerrand 1/10 oz",
   "slug": "gold-krugerrand-1-10-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "Rand Refinery / South African Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Krugerrand",
   "weight_g": 3.393,
   "diameter_mm": 16.55,
   "thickness_mm": null,
   "c0d2_hz": 7115,
   "c0d3_hz": 16430,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.072,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-krugerrand-1-10-oz"
  },
  {
   "name": "Gold Krugerrand 1/2 oz",
   "slug": "gold-krugerrand-1-2-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "Rand Refinery / South African Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Krugerrand",
   "weight_g": 16.965,
   "diameter_mm": 27.07,
   "thickness_mm": null,
   "c0d2_hz": 4970,
   "c0d3_hz": 11450,
   "c0d4_hz": 19930,
   "tolerance_c0d2": 0.071,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": 0.065,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-krugerrand-1-2-oz"
  },
  {
   "name": "Gold Krugerrand 1/4 oz",
   "slug": "gold-krugerrand-1-4-oz",
   "metal": "gold",
   "fineness": ".9167 gold (22k)",
   "mint": "Rand Refinery / South African Mint",
   "mint_source": "https://en.wikipedia.org/wiki/Krugerrand",
   "weight_g": 8.482,
   "diameter_mm": 22.06,
   "thickness_mm": null,
   "c0d2_hz": 5635,
   "c0d3_hz": 13000,
   "c0d4_hz": null,
   "tolerance_c0d2": 0.072,
   "tolerance_c0d3": 0.065,
   "tolerance_c0d4": null,
   "confidence": "good",
   "guide_url": "https://coinpinger.com/coins/gold-krugerrand-1-4-oz"
  },
  {
   "name": "Gold Libertad 1/2 oz",
   "slug": "gold-libertad-1-2-oz",
   "metal": "gold",
   "fineness": ".999 fine gold",
   "mint": "Casa de Moneda de México (Banco de México)",
   "mint_source": "https://en.wikipedia.org/wiki/Libertad_(coin)",
   "weight_g": 15.552,
   "diameter_mm": 29,
   "thickness_mm": 1.8,
   "c0d2_hz": 2915,
   "c0d3_hz": 6750,
   "c0d4_hz": 11840,
   "tolerance_c0d2": 0.091,
   "tolerance_c0d3": 0.085,
   "tolerance_c0d4": 0.085,
   "confidence": "provisional",
   "guide_url": "https://coinpinger.com/coins/gold-libertad-1-2-oz"
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  {
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