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There is no mark, or choke designation. What you need to do is invest $100 in a Skeets Bore gauge from Midway, or find someone who has one, and measure your bores and chokes. If you have a 12 the bore will probably be .733". About 3" +/- from the muzzle the bore will begin to constrict to around .700" at the muzzle. If this be the case you have .033" of constriction, or full choke. .020" is modified and .010" is imp. cyl., generally speaking. There's lots in between too.
Threaded Mode