I think we have now uncovered all the possible details and history of your prop.
Incidentally, this prop was not used for testing engines. It is too fragile for constant changes from engine to engine. A purpose built air brake prop is used. It is of substantial construction and small diameter with large metal plates set at right angles to the direction of rotation, which places a considerable load on the engine under test. This allows each engine tested to be calibrated and faulty engines to be identified.
With kind regards,
Bob
Also, although it may not have been a "test club" (as Bob describes) for testing the engine it may have been either a custom made or experimental prop for that engine, in which case the design number might not appear on any list of "approved" propellers.
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