The Becker shotgun is a very unusual blow-forward, revolving cylinder shotgun made in Germany in the 1920s (although it was originally patented in the late 1890s). Only a very small number were made – allegedly as few as 100. The serial number on this one appears to be 755, which could mean more were made, or that the company perhaps numbered several different types of guns in the same serial number block. All of the known examples are in 16 gauge, with a capacity of 5 rounds.
Thanks to Hire Arms in Johannesburg for giving me access to this very scarce gun to film for you!