It's interesting. I wonder if "special bore" refers to the special 12/14 ammo, available only to police. For what ammo is your gun chambered? Look at the breech face, and if there appear to be holes for extra firing pins, it is probably chambered for the special police only shells. You can find information on Greener police guns here: [url=https://www.historicalfirearms.info/post/129871795587/greener-martini-shotgun-in-the-1920s-there-was-a]Historical Firearms - Greener-Martini Shotgun
On receiver could be 12814 in arabic numbers.
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