I found this quarter at work in the casino. Is it a 40% silver? I had 40 copper 1976s and I used them for laundry. The copper 76 in circulated condition is not worth saving. I do some CRH at work. Everytime I open a roll of coins at work I am CRH.
It looks like it is an uncirculated "S" mintmark which I believe would make it 40% silver. I believe the only "S" mintmark copper-nickel coins are proofs and yours does not look like a proof.
If its 40% silver it will look like a 40% silver half with a two tone. Usually the two tone is a darker grey or silverish and very obvious, but in some halves usually the 1969's that are in good condition the copper edge is quite clear.