B200   Sam Constanzo, World of Lugers,
Volume I, Proof Marks: a complete listing of different variations of proof marks on the Luger. Hardback 432 pages. Costanzo, 1977. Not just Proof Marks but all the many other inspection and acceptance marks which can be found on Lugers, including holster manufacturers and their codes, Naval grip strap markings, Mauser banner serial numbers.
A clean copy in good condition.