Eisenhower dollar coin S mint mark silver vs clad how do I tell the difference

I thought I knew a lot about the Eisenhower dollar, I have a number of them. However, some of the ones with "S" mint marks are silver and some are clad? How can I tell the difference? Thanks!

 

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Look at the edge. Silver are silver and the clad show copper.

 

1971 S and 1972 S are silver; 73 S, 74S, and 76S may be silver or may be clad.

 

Easiest way to tell would be weighing them

Copper-nickel issues:

• Weight: 22.68 grams

Silver-copper issues (silver clad):

• Weight: 24.59 grams