propeller ID

[Valentine]

I have a wooden propeller that my father collected. It is 8', 8 bolts, oak, copper on tips.
Hub is Marked K58 and there is a very small image that looks like 4 propellers with a B in the middle. on the side of hub is SC28939.
What do I have.
Thanks

[Dave]

Those are Signal Corps markings, probably from the early twenties. I don't think it can be identified from that information alone. Go to this page to see if you can narrow down the engine possibilities.