Hi Corado
I tend to agree with the other two responses. A big give-away that it was made for decoration only is that there are no side lock screws. Just two flat-head wood screws mounting the lock from the outside of the lock plate.
It could also be one of those Victorian era copies, where a combination of original surplus and new made parts (for then) were utilized. I'm some what leaning in this direction.
Rick
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