OLUT,
Thanks for those images.It looks pretty good for a 200+ year old gun...a few stock issues,like you say,but nothing serious.I bet it handles pretty nicely.It's been well used too,judging by the wear on the frizzen axle/pin.
What's on the locket or plaque on the side.....a crest or initials maybe?.....
Any proofs on the barrel?......Irish guns generally don't but sometimes either the barrels were imported or the gun was made for export and proofed in London.
Any inscription on the top barrel flat??.....maybe
DUBLINAre there any registration numbers on the barrel or butt plate.These would have an alphabetic prefix and number following.It might be feint though.If not it had probably left the country before 1843.
I would say this gun would date to maybe c.1785-90......The roller on the frizzen foot might suggest that....later the roller was more usual on the spring end.The style of the lock plate inscription would suggest an earlier date as well
Richard might have something to add
Nice gun