Full specs for your coin:
Composition: 99.9% silver.
Minimum Weight: 1.0000 Toz (31.103 g)
Content: 0.999 Toz (31.072 g) silver, balance copper
Diameter: 1.598 in. (40.60 mm)
Thickness: 0.120 in. (3.05 mm)
Edge: reeded
Mint Mark: none
The Silver Eagle differs slightly from its gold & platinum counterparts in that the Au & Pt coins contain at least 1.0000 Toz of precious metal, whereas the SAE weighs a minimum of 1.0000 Toz total, including the copper. SAEs contain at least 0.999 Toz of silver, GAEs contain at least 1.0000 Toz of gold. The American coins have a guaranteed minimum amount of the desired metal with their production tolerances skewed high to maintain that promise. This is clear incentive for the mint to maintain very close tolerances to avoid too much loss to overweight coins. The 5 Toz
ATB coins are specified the same way as the SAEs, with a minimum of 4.995 Toz of silver.