I can really only guess, the prewar bolt stop. I saw a 1938, made in Germany sold for thirty two on GB, I'm not sure if the link is still live or if I can find it. I didn't see the auction when it was live, my user name should really be hindsight anyway. I was hoping to be informed of how large my fools award should be for acquiring the M-S Premier, I know Blue Book value, "so called" it's not mint.