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Old 11-14-2018, 07:36 PM   #4
Dbahnson
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Unfortunately, there were thousands of different models of propellers and many different models look almost exactly like other models. Even with data stamped on them, they can be very difficult to identify. There were 25,000 Paragon propellers manufactured before the end of WW1, and they continued for some time after that..

There seems to be a big difference in the two propellers pictured, the lower one more typical of an early, low powered engine. I'd have to do a little more research but there was also S1 actually a Mercury S1 from 1931. this page.

Is it possible that the photos are from different models altogether, both with an "S1" designation?
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