Hello:
I agree with Fernando, I think it's a shotgun. The name on the key (lock) I think it is Italian, if a key (lock) produced in Spain have the punch Manufacturer gold.
It would be interesting a photograph of the punch in the barrel (barrel) to see who produced it.
In short: I think it is a weapon produced in Italy, perhaps in Naples (under Spanish rule) and used a gun / barrel) produced in Spain
Affectionately. Fernando K
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