The Belgian proofs are post 1924. The date code (1927) does not match the controller of proof for dating (1937-1964). I agree with Larry, many marks are missing....

Some of those other marks appear rather amateurish.

Gaier talks about stock carving, but the only Belgian guns I have seen with it were for export or are high end guns in museums. This one is much nicer than those cheap export klunkers. Checkpiece, sling swivels, 65mm 16ga, it was certainly meant for the European market.

Pete