Rolls Royce strong/weak carburation adjuster for on steering wheel. For 40/50HP Rolls Royce. Numbers on back of casting difficult to read, I believe it says 7 71AT1. Teeth in good condition.
One fairly complete small 4 cylinder engine, probably made before 1920, no detachable head & adapted for marine use, in reasonably good condition. It could be an engine for an early American cycle car, we would love to find out.