Chris,
There was a post on the site "www.woodenpropeller.com" in 2007 about a prop with the same markings as the one you are referring to. It may be the same prop. The prop expert on that site made a guess and came up with the Gnome Rotary engine, but did not speculate on an airframe. It did appear to be conclusive as to a WW1 time-period. The list of planes using that engine is probably pretty short.
Edit - Mike beat me to it.
Walt
_________________ If God had intended airplane engines to have horizontally-opposed cylinders, Pratt & Whitney would have built them that way.
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