The ProofHouse numbers sound incorrect.

Probably one of the best sources for dates of mfg. is John Brunner's book, "The Colt Pocket Hammerless Pistols". Brunner did extensive research on these pistols, and I beleive he used Colt assembly and shipment records as well as Government contract info to determine manufacture dates.

Another reason these two pistols were not made in 1942 pistols is because Colt didn't start to parkerize the Hammerless Autos until well into 1944.