Silver bullet

[Oneil1979]

Searching through the iron got a faint squeak, flipped the plug and saw a shell casing, rechecked the hole, pulled out the bullet, stuck both in the bag, later while going through my finds I was shocked to see the bullet is sterling silver marked! The casing is obviously a novelty it’s split in half with a hole in the middle not sure how it was secured but it’s a unique find to say the least, no head stamp on the shell. Thanks for looking.