a commemorative half dollar dated 1925 and has the S mint mark. S means minted in San Francisco. Made of 90% silver.

Here is a sold version
https://www.ebay.com/itm/396243663399?_skw=1925+S+half+dollar&itmmeta=01JNFKHBPQE6NNRCYSNEEA6XBJ&hash=item5c41f67a27:g:GngAAeSwvihnvRXC&itmprp=enc%3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1d1m1YLfY0GmrkfSJ4AjORI1KGGUsW%2FGT1uNKuIpXKMsj8nEWadIrrMHt2Fa6SOG0%2BUbkvutXuR7d9LhC4FUqN4txhJbVBdG%2BBQSS1HHziXcIpmOq08r%2Fv%2BkLZ6KqgBuu6DDWZDo%2FA6zGRc93W%2BCjBRAwgGu0UMFLbcVnaNo63TOP6LjYn%2BlrjwD8%2FsGgUWrtncJRhsIAk9TlFOXiNyYf68%2Fa5dVegtlB3T6xhd5MejE8edFx0ldXOHXaxy9x9hqwc%3D%7Ctkp%3ABk9SR767xfOrZQ