See the 1937 Parker catalog for specifications. "Made in 12 gauge only" according to the catalog.
206 were made in various grades and barrel lengths from 30 to 34, according to the chapter in TPS on trap and skeet guns, see p. 402.
I think Baer unintendedly overstated a bit , but they certainly are uncommon. You don't see many of them but if a person wanted to find one and made it known, I suspect one would appear. There are some smaller gauge guns with vent ribs, but I don't think you could properly call those "Double Trap". There are other groups of Parkers that are much rarer.
The Double Traps are very much a specialized gun, so I found when I owned one. The rib slopes down and the gun is designed to shoot high for a rising target. I have shot Parkers with vent ribs other than the Double Traps and I did not find that they were sighted to shoot high. For its intended purpose, I think a Double Trap is a perfect gun.
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