Thanks Pete,

The only single letters are Z and X with stars above them, which I think are inspector's initials.

The one mark that I couldn't figure out looks to be a small cursive S, which would be a 1940 date. Would they have made a hammer gun that late?

The hammer gun pictured in the first site you listed, looks just like my gun with a little different engraving.


Don't sacrifice the future on the altar of today