I have just come back to this thread, and see that pics of the inside of the lock and the lock cavity have been posted since I was here last time.
In my humble opinion, those screws look modern to me, and show next to no wear from having been removed. Also there appears to be clear evidence of circular marks towards the edge of them. This is not what I would expect to see on old internal screws. Most old locks also show deforming of the screw slots from "attention" by non armourer trained people.
The pics I have of similar locks, have screws with heads which are far more "barrel shaped" as opposed to dome shaped which appear here. Also the lock cavity seems very clean for an item of some age. I would have thought that there would be noticable residue of powder and oil.
I don't think that this is a kit, but equally I am not 100% sure that it was made to ever be used in anger.
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