So i need some help here; where is the cavalry ?
One thing i know is that:
This is a Roman lock, or Llave a la Romana, or Acciarino alla Romana or, in my lingo, Fecho à Romana.
Things i don't know are:
1 - Was it made in Italy ? most possibly yes ... but not necessarily; the Spaniards made them and the Portuguese too.
2 - How old would it be ? Could it still fall into the XVIII century window ?
Note the frizzen inner face is replaceable.
Length:20 cms. (Basically for a shoulder gun).
Weight:665 grams.
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