This lock landed on my desk on Friday, source is a French Farm House.

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It uses a 'wing' on one side of the key bit instead of a collar to control key insertion.

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To make the key I had to start with a blank that had quite a large bit in order to thin it to the desired 'L' shape, remove the stock collar, warding, then add a bit of patina to blend the work in.

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I can't see any markings on the lock so if anyone can shed any light on it I would be grateful.