Again, thanks for the info! I was not familiar with Air Arsenal North America, but now have a copy on the way.   Here is some truly trivial trivia for the Martlet II modeller. My guess is that these are early examples with "A.M." serials:   1) Yellow arrows: on most Wildcats, the small rectangular door that accesses the crank for the wing fold lock pin is hinged on its inboard side. On these machines - the very first folding F4F's - it is hinged at the rear. I would think the
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