Ike silver dollar question

Hey there cointalk! I'm curious how can I tell the difference between a 40% Ike silver dollar and a regular variety? Thanks for any answers!

 

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Copper-nickel issues:

• Weight: 22.68 grams

Silver-copper issues (silver clad):

• Weight: 24.59 grams

 

The edges look different, and they look very different when you view them through a sheet of tissue. If you don't have examples of each to compare, or even if you do, a weight test is best; clads weigh 22.68 grams, silver weigh 24.59 grams.

 

also the 40% silver will always have an "s" mint mark,but not all "s" mint marks are 40% silver

 

Thanks for the answers everyone!