Hi,
That’s the prop from the prototype made during WW1 I think it was called called S.E.5, B.E.2 or R.E.8 or something simular!
(What I want to know is how the hell do you tell the time when it’s spinning around!)
cheers,
-John
Not doubting you, but how on Earth can you tell that from (a) a bad photo (b) the only visible detail is a nut count. (And the nuts won’t be original).