A Mauser type B rifle, factory code BRCD (600 mm round barrel,tangent rear sight, two stage trigger). The serial number 109864 dates it to 1931, according to Jon Speed's books. The crown/U (Untersuchung = inspected for defects) is part of the contemporary BUG proof marks, stamped by the Oberndorf proofhouse from 1924 to 1934. The BUG marks are hardly visible on the receiver ring of this rifle, in front of the serial number.