Anderson crank operator approximate 1995 - 1998.
A quick learner says:
June 18, 2015
The part # on this arm is C-9400-1 viewed from the top. Flipping it over, it is stamped F-9400-8 on the bottom plate.
Paul from SWISCO responded:
June 19, 2015
Hello! Could our 39-264 be a match for you? It looks like the tabs have broken off of yours, but see what you think.