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What do you collectors think? A previously unknown BSA prototype, or are the instincts of John and Mark Knibbs right, and it is a fake? We will probably never know definitively, but I would be interested to hear others’ opinions.
I struggle to think a company like BSA could prototype an air pistol and there be no surviving written record at all, although of course you could never be sure. The fact that none of the design innovations appear on other bsas might also be a point against.

If it was suggested that a BSA designer or engineer produced something as a personal project, and perhaps marked it with the company logo almost tongue in cheek, that might be more possible?

If it is right though that the markings are a little unprofessional, can we revisit if we are sure beyond doubt it is British? They make all sorts of funny firearms in India, for example, or so I am told.

It’s a very interesting item no doubt