Bingo. The serial number is a six-digit one: 6826xx. The last four digits matching those on the butt of the grip.
So, the mystery is: why would the first two digits be missing?
I read an earlier message where someone noted that their gun had a round spot where a lanyard might have been mounted but was filled in. That describes the condition of my gun handle also, but that would make it seem that it was done aftermarket and then reversed. The other possibility is that someone faked the lanyard hole after removing the first two digits of the serial number.
Still doesn't make any sense to me, but I think I have a better idea of the gun's age (late 1930's, based on earlier posts here).
Last edited by Glenn E. Meyer; November 30, 2013 at 11:47 AM.