Hello Sville,

Many thanks for emailing a copy of the Belgian Proof Marks. In finding a copy of the Date codes, I see they started using them in 1922. Therefore I know this double was built in 1921 or earlier.

I also found your reference (number 4) says: "Bore diameter in millimeters. Until 1894, stamped in .02mm graduations, then in 0.1mm steps"

Since this rifle's bore is stamped "12.0", it would indicate it was made in 1895 or later. So ... I guess I can reasonable assume it was made sometime during the span from 1895 up to 1921, a span of 27 years.

If there is any more info out there that could be used to interpret the inspector's markings, maybe the manufacture range could be narrowed further still.

My best guess is late 1890's.

Your thoughts?