Carbine for comments

[fernando]

Once again a gun of indistinct provenance, although i would appoint it to a Portuguese origin. The style of the hammer used for the conversion from flint to percussion is typical of Portuguese modification from the Pé de Cabra (goat foot) flint version.
Also the 'scars' on the lock plate suggest the home of a Portuguese frizzen spring.
The Britishized swivel ramrod is missing; i am thinking hardly of having one made, after an old spare rod and new swivel parts.
The calibre is typical of a smooth bore, indeed one larger than usual for a carbine, with 20 m/m (10 bore).
I wouldn't know what to make of those 'marks' on the barrel breech; whether they are real marks and where from... assuming barrels are usually non Portuguese.
Butt plate, trigger guard, ramrod pipe and forend cap all in brass, showing nice patina.
I would place the date of this piece between end XVIII / beg. XIX centuries.
Barrel length 52 cms. Total length 89 cms.
Would anyone care to comment on this piece ?
Thanks

.