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Prop information please

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Colonial Boy

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Oct 18, 2019
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New Zealand
I have recently acquired a wooden prop made by "Propeller Engineering Duplicating" of California. The manufacturer is no longer trading. Stamped on it is 22 69 50 310. The "22" would be pitch and "69" is diameter - both in inches. Can anyone tell me what the "50" and "310" would refer to please?
 

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