Seems to be the markings on inside are. 7 l. 8. . I figured it was some sort of cover from a watch or. Some other thing, it looked to nice to be a tin .I think its silver , it is thin, but stronger then I don't no maybe alum .Well it was down deep and been there along time and it has no corrosion on it. I don't no if mother nature takes a toll on silver coins that where lost or its more the ware of the coin before it was lost, but all the coins in this area come out mint.Nice Seated. That over thing looks like a pocket watch cover to me. Is it silver?