90% Silver Kennedy Halves were only made in 1964. Before that it was the Franklin Halves, also 90%.
From 1965-1972, Kennedy Halves were made of 40% Silver.
Hey what's up with that ingot? Is it hand-poured? At first I thought you said you made it yourself, but then I went back and reread.
It sounds kind of funky. I'm curious. Pics?