I saw a really pretty antique ring with engraving on the inside that said from MM to JK 1940. It was a pretty good price and I wondered if it was because of the engraving on the inside being unremovable.
-Kitten
I think that engraving is really neat.... Just think, that was 64 years ago...right about the start of World War II... It's a piece of history, a mystery to wear.
Sorry...I kow this in no way answers your question but I am very sentimental and couldn't resist.