This Samuel Ebrel of Shrewsbury 12 Bore is in good enough condition to fire but like you I am a UK resident and I keep it off ticket and as you say if we use pinfires they have to go on our shotgun licence. I do find this extremely frustrating just to be able to use the gun a couple of times a year so like me the gun has given up smoking permanently. Just one thing that might be of interest the Damascus barrels still have the remains of its “Russet Browning” an extremely thick rust layer which was saturated with mixtures containing Tallow, Lard, amongst other things popular with the UK west coast Wild Fowlers. Though I do think the hammers are way out of proportion especially when you see other maker’s pinfires.

