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depends on the contract. pin lock talons, crowns, sun burst talons, possibly conmars as well. even within individual contracts there may be two types of zippers used.
Jack, most original B-3s had Talon Zippers. Conmars were used on a few contracts, notably those awarded to H. Bernstein. You can buy a NOS Talon M39 or M42 zip from Vintage Productions in the USA or direct from MASH Japan. Occasionally you see a B-3 with a Crown, but these were fragile and not widely used on this heavy fleece jacket.
if i am not mistaken, crowns were used only on aero b-3s, and only a few at that. areo discontinued the use of crowns mid contract. as andrew mentioned, they were not exactly robust enough to withstand the rigors of heavy garment use.
The 1942 RW on John's CD has a factory fitted Crown on it, but it's the only RW I have seen with a Crown suggesting they were not used very often on B-3s.