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Ratner 9-lever lock - powder proof!
I got another (probably) Ratner lock. It looks powder proof, has 9 levers and a mechanism to block the bolt unless the levers have been lifted. I assume it is a pretty standard Ratner safe lock, although the modern (probably) replacement keys are quite long (and not well cut). The serial is 69296. (Nothing else imprinted in the lock.) From the other serials I have seen from Ratner I would date it to the beginning of the 1960s, but a powder proof lock made in the 1960s seems to me indeed quite unlikely. So I have quite some information about this lock, but most is just likely and unlikely. I would be grateful for some clarification.