I wondered what the Mauser number would indicate. I'm aware that tables exist, including one in Speed's book, but I don't have one. The Rigby table shows the Rigby number to be 1940-1945. Makes one wonder where it lay about in the intervening years. Bonham's just sold a pair of Lang double rifles that were delivered in 1927, but built in 1907. That kind of thing was more common than many think.

Pity that an American "gunsmith" got hold of it.