Guns with vent ribs

[B. Dudley]

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???

[C.O.B.]

I have serial number 222223 a DHE vent rib 20 which falls into the 1927 date of manufacture.

[Bill Murphy]

Brian, there are four stock books missing between 1923 and 1927 representing at least 12000 guns. After 1935 or thereabouts, there are only IBM cards, with many of them missing and many not fully describing the guns. Therefore, the 377 figure in TPS is only part of the vent rib story.