Coin Silver Content: Some Useful Numbers

After using this method to determine specific gravity for my coins, I thought I would post a few new calculations I've made for various silver alloys, which might be useful to a few of you.

First are some non-silver alloys (fixed values for given composition):

Nickel silver (German silver) 650 Cu, 180 Ni, 170 Zn SG = 8.67
Cupro-nickel (750 Cu, 250 Ni) SG = 8.94 (Used in Aus/NZ decimal coins or US nickels)
Bronze (970 Cu, 25 Zn, 5 Sn) SG = 8.89 (Used in Aus. predecimal coins)
Bronze Lincoln Cent (950 Cu, 50 Zn) SG = 8.84
Bronze Canada cent 1942-89 (980 Cu, 5 Sn, 15 Zn) SG = 8.57
1.0 Nickel coins (such as Canada 5c 1955-81) SG = 8.90

(These figures are very useful for verifying your SG testing methods)


SG for silver alloys (where remainder is copper):

.999 = 10.49 (ASEs, silver rounds and bullion should test to this)
.935 = 10.41 (Some Spanish colonials)
.925 = 10.39 (Sterling silver, ie Canada to 1919, Australia to 1945)
.917 = 10.38 (Some Spanish colonials)
.900 = 10.31 (US Coin silver)
.850 = 10.23 (Swiss silver coinage)
.800 = 10.17 (Canada to 1967)
.750 = 10.08
.600 = 9.84
.500 = 9.68 (most Australian pre-decimal silver after 1945)
.400 = 9.53
.300 = 9.38
.200 = 9.23
.100 = 9.09 (Mexico billon Pesos 1957-67)