nice find... I got thousads of coins from the beach an many are in very bad shape, makes me wounder how many are silver an I just don't know, maybe I should tumble some of my coins 1 day an see what I got
you can tell by the sound they make when you drop them on the floor. take a silver quarter and a clad quarter and drop them on the same floor from the same height. the silver will have a crisper higher clang to it. try it! works with all similar sized coins. dimes work the same for example.