A propeller of that size and with those stampings would almost certainly not have been used on a certificated airplane. An ultralight is another possibility, but without seeing it it's hard to be sure of its value.
Having decals and original finish helps the value of a propeller in any category.
Ah! I think that's either an airboat or a snow sleigh propeller. While not highly collectible, it might sell for a few hundred dollars on eBay. (Unfortunately, people often pay more than they should because they think it's an aircraft propeller.)
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