coin certificate record
authentic.cosigo.io • certificate 815566 / 815567
coin certificate — specification + density verification
Reference Number
815566
Seal Reference
815566 and 815567
Coin Grade
AU +
Year
1893 O
Type
Morgan Dollar
Claimed Material
silver 0.900
Coin Weight
26.7 g
Dimensions
37.8mm x 2.5mm
Primary Material Verification
Displaced Water Weight
2.6 g
Water Temperature
23 °C
Initial Water Level
150 mL
Final Water Level
152.5 mL
Water Density Used
0.997 g/mL
Displacement Volume
2.6078 cm³
Measured Density (Water Displacement)
10.2384 g/cm³
Expected Density (silver 0.900)
10.31 g/cm³
Variance From Expected
0.6942 %
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
2.8055 cm³
Idealized Geometry Density
9.5169 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
815566 and 815567
coin reference images
Click any image to enlarge.
