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Helsinki Mint · Finland
Finnish Gold 20 Markka
0.1867 troy oz — 90% Gold, 10% Coppergolddiscontinued
Finnish gold coin from the Russian Grand Duchy period. Same weight as Latin Monetary Union coins. Features the Finnish coat of arms. Minted 1878-1913.
Physical Specifications
| Mass | 6.452 g |
| Troy Ounces | 0.1867 oz |
| Diameter | 21.3 mm |
| Thickness | 1.35 mm |
| Edge | reeded |
| Purity | 90% Gold, 10% Copper |
| Fineness | 0.9 |
| Density | 17.2 g/cm³ |
| Face Value | 20 FIM |
| Series | Markka |
| First Minted | 1878 |
Authentication Reference
Use these values to verify an authentic Finnish Gold 20 Markka. All tests can be performed with a digital scale, callipers, and the EON ping tester.
Weight
6.452grams
Use a 0.001 g digital scale. Calibrate first with a known object (a €2 coin = 8.50g).
Dimensions
Diameter21.3mm
Thickness1.35mm
Use plastic callipers (not steel — avoid scratching). Or use the camera tool with a bank card as reference (ISO 7810: 85.60mm × 53.98mm).