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Old 08-05-2017, 08:24 AM   #4
Dbahnson
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While there may be some characteristics of the stampings that were used by different manufacturers, even those tended to be changed frequently, and there were literally hundreds if not thousands of manufacturers producing propellers in the late teens and early twenties. Original decals are really the only way to identify the manufacturer unless the name was clearly stamped into the wood, which was very rare in my opinion, at least in the U.S.

Those other stamps are usually inspection stamps of some kind, and may not have been done by the manufacturer itself.

Also, it's not unusual to see a propeller shape and size that was made by multiple different manufactures using the same blueprint (drawing number), often under a government contract. The top one was manufactured by Starr Piano Company, the bottom one by Hartzell.




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