If that is indeed the case, looking at the engraving carefully I would be inclined to believe that the engraving at the rear of the lock is one hand, and perhaps at the time of conversion to percussion someone got jiggy with it and decided to add a name and date (for some inexplicable reason, but perhaps a memorial etc) because that engraving doesn't really match up with the engraving at the lock tail. Then when it was reconverted someone tried to match up the better and more professional engraving at the lock tail and did a good job of it.
The excessive filework still is a bit odd - not clear on that.