The lock is the 1793 India pattern type 1. The double line around the sear screw is slightly unusual but presumably even ordnance contractors were permitted a small degree of self expression. Normally its a single line and was omitted altogether on the 1809 type 2. The cock is 1809 type 2 , Their isnt anything inconsistent with this since the basic locks are the same and after the end of the Napoleonic war the Ordnance system had a vast stockpile of parts to use up . I have one stamped crown V.R. so even as late as the 1850s the Tower was still assembling these locks for use in far flung corners of the world. And yes . the spring is about to drop off the end of the tumbler , but this is generally just wear and tear. Hope thats helpfull.
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