This piece was in my son's Forest Fire set, the Fire Plane set. The plastic feels terribly cheap and looks like a Mega Bloks piece.
So far I've identified one brick that says 'LEGO' (set 642) but I can't link the ones with the other words and letters to sets. Same goes for the doors... Anybody?
The doors confuse me - they are type 801a and 802a, and they exist in red, blue and yellow - I have a couple laying around somewhere - but I can only find one set (730) that uses any of them. But they are definitely from the late 1960s.
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