Date of Manufacture
NON POUR BALLE - choked unrifled bores used 1878 - 1897
1898 - 1910 Bore in mm (22 cm from breech) and muzzle (choke constriction) appear next to each other after choke
1910 1924 Bore in mm is over muzzle dimension
Prior to 1924 the gauge would be indicated within a diamond.
Post-1924 - A 12-70 in an Omega lying is the gauge and chamber length in mm., and would indicate the gun is chambered for 12ga 70mm or 2 3/4 length shells.
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