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I believe that the first aid kit of this style was a general item that would have been in a wide variety of non ejection seat aircraft and helicopters. I have seen them in many airframes from Huey's to C-130's.
I have a WWII era kit that is basically the same, only in canvas.
I am on vacation right now, and return home next week. When I get home I will give my survival equipment reference books a look see for more specific information.
The only number I can see appears to be a National Stock Number (NSN) or Federal Stock Number (FSN). Do any of the components have dates? This may be a more reliable clue as to the kit's vintage, although of course they are expendable and could have been replaced over time.