There is one in Harry Jone's book
Luger Variations pg 209, pub 1959.
Datig also mentions the possibility of Japanese 'Mum' Lugers (but no pictures) in the 1958 revised printing of
The Luger Pistol.
As with the Totenkopf Luger(s), I seriously doubt that anyone in 1959 (or earlier) would have bothered faking a less than $50 Luger...
IMO there must have been at least one with the markings. Maybe not an 'official' stamping, but realistic enough to convince the experts of that period.
