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J. Duce & Sons Diamond Detector Lock Invented prior to 1856 7 Lever 4 1/2 x 4" Body Case.

Duce(junior) Diamond Detector lock. The detector is fixed to the main bolt and works upon a stiff joint If the levers are overlifted it blocks the main bolt against a stump fixed in the lock-plate preventing the bolt from being withdrawn. Mr.Duce(jnr.) is one of a very few master locksmiths who worked at the vice and he is considered to be a first class workman.