I recieved an email today from the auction house and they answered my question about markings. On the reciever side there is 7.9mm. and then in a different spot 6.27, and then 845. I know the 7,9mm is a caliber designation, but not sure what caliber. The other 2 marks I'm not sure on. I think the 6 27 could be June 1927. and the 845 may be a serial number.
Mike


Mwhite, USN retired