coin certificate record
authentic.cosigo.io • certificate 815560 / 815561
coin certificate — specification + density verification
Reference Number
815560
Seal Reference
815560 and 815561
Coin Grade
Coin Grade: MS-69 DMPL
Year
2012
Type
Chinese Lunar Year of Dragon
Claimed Material
silver 0.999
Coin Weight
31.3 g
Dimensions
38.4mm × 3.0mm
Primary Material Verification
Displaced Water Weight
3.0 g
Water Temperature
24 °C
Initial Water Level
150 mL
Final Water Level
152.7 mL
Water Density Used
0.997 g/mL
Displacement Volume
3.0054 cm³
Measured Density (Water Displacement)
10.4146 g/cm³
Expected Density (silver 0.900)
10.31 g/cm³
Variance From Expected
0.7192 %
Verification Tolerance
±2.5%
Result
OK — PASS: measured density is within ±2.5% of expected density for the claimed
material.
Method used: displaced water weight (2.6 g ÷ water density 0.997 g/mL)
Dimension Cross-Check Only (Approximate)
Idealized Geometry Volume
3.4744 cm³
Idealized Geometry Density
9.0089 g/cm³
Real coins are not perfect cylinders. Geometry is shown only as a rough cross-check. Water displacement is
the primary verification method.
Signature
Wendall Gregory Wilson Authorized Representative for COSIGO
Seal
815560 and 815561
coin reference images
Click any image to enlarge.
