Very nice Jerry. It's a Manufacture Liegeoise D Armes À Feu.
It carries Smokeless Powder proof and has 70mm = 2 3/4" chambers.
The barrel weighed 1.4309 Kg = 3.15# at the time of proof. If the barrels were later honed, they would still be in proof if the weight loss was less than 3%.
I can't read the numbers, but forward of the flats is the bore over the choke in mm; used c. 1910-1924.
The "Acier Special" barrels were also used by Fabrique Nationale Herstal
It does not have a lettre annale so it was made prior to 1921 and with 70mm chambers I very much suspect after the end of WWI, which would narrow the DOM to 1919-1920.
Cornell Pubs has a 1932 ML catalog reprint which might show the model.
Amazing all that can be learned from the Belgian marks!
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