Volune 2 of TPS has a list of Vent Rib guns. There are 377 guns on the list. But the earliest serial number is a 1927 built gun. And 1923 was the first year for recorded and cataloged the vent rib option on double guns.
So there are 4 years worth of guns not on the list at the beginning. Not sure why???
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B. Dudley
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