Welrod [SEP] manufacturer
or country of origin; it was only marked with a serial number and some inscrutable symbols and letters. The Birmingham Small Arms Company Limited (BSA) confirmed that they manufactured some Welrod pistols, but that they put no markings at all on them, so it is likely that any markings were added by the British military after delivery.
The original model was the Welrod Mk II, chambered for .32 ACP. This was the primary model. Due to poor field results, the Welrod Mk I was subsequently developed using 9×19
the right people were properly credited for their inventions at Station IX. This document reveals that the inventor of the Welrod was Major Hugh Reeves. He was also responsible for other important designs, including the sleeve gun, which was similar to the Welrod, though single shot and made to conceal up a sleeve.
The Welrod was used primarily by the British SOE but was also used by the American OSS and Resistance forces.
The Welrod was a "sanitized" weapon, meaning that it had no markings indicating its manufacturer