I'd say no to a prototype because I think I remember the prototypes having subtle changes here and there that were made before production. I don't remember what they all were. As for the air breather, repainted maybe? From a different brand that used the same breather? Now there is a slim chance you've run into a 3 digit Original? I'm just speculating things now. Even a prototype would have a serial number though.
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Preserving history... one Cub at a time.
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