Dean, depends on whether you are talking about the specific 1937 cataloged Double Trap or whether about hundreds of other double barrelled vent rib guns of various grades and gauges that could be used for shooting trap, skeet or game. TPS lists a lot of vent rib guns. And not all guns that were likely used mainly for trap were vent rib.
I had a discussion with Mark Conrad about the TPS numbers, and it was his opinion that there were a lot more late vent rib guns than were identified in the SN book. There were a lot of late small bore guns too, so maybe it follows that there were a lot of late small bore vent ribs that exist and are not in the books.
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