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Finest pump ever made there, I still have my uncles M12 made in 1921, it is a Tournament Grade Trap (marked) with milled vent rib, if you need to date yours or need any info on it let me know. Are the received and barrel proof marks still intact? If it was a field gun they were on the top and will be under the rib now, the factory rib guns they were on the left of center at 10-11 o'clock position.
The problem with M12's is most who want one already have one, the younger shooters are not familiar with them.