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Old 02-28-2019, 01:25 PM   #2
Dbahnson
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Unfortunately in most cases the manufacturer's name was only on the decals, and absent that there's no characteristics of a hub that would define a specific manufacturer or even model of propeller. The best you can do is eliminate some of the engine possibilities and establish a "probable" engine application.

I'm guessing that it's an OX5 hub, but you can go to this page to see how to get exact measurements then follow the link to the data page.

The "13613" is almost certainly a serial number, as I could not match it up with any published design numbers.

There are some marks that suggest that it was mounted on an engine at one point, and the usual story that goes with a hub-only prop is that the tip(s) were damaged in a ground strike and what was left was removed to save the hub.
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