FWIW: I've got a small book "Know Your Broomhandle Mausers" that was printed in 1985. Written by R.J. Berger, it covers everything up to and including the Schnellfeuer. Serial numbers, proof marks, even strange calibers such as the 8.15mm Mauser - all are here.

I paid $695 for it in 1985. Make an offer.

Tom Murphy
Las Vegas
tfmurphy3@yahoo.com