I too think that is a Kavanagh Finian. He was an eccentric inventor and the Fenian is said to have been the last shotgun to have been made in Ireland. This is what IGC have on them:
Name P V Kavanagh & Sons
City/Town Dublin
Country Ireland
Trade Gunmaker
Dates 1850?-1965?
Notes
It appears there was a firm known as P V Kavanagh & Sons in Dublin, Ireland. Its relationship, if any, to William Kavanagh is unknown. P V Kavanagh & Son appear to have designed a vertical barrelled (O/U) gun which they had made for them in Birmingham. The gun had a slide-forward breech opened by a push-down top lever which lifted a vertical locking bolt behind the breech face. As the breech opened, assisted by the mainsprings, fired cartridges were ejected with the assistance of a spring operated bar in the action bar. On closing the gun the locks were cocked, and the barrels slotted onto adjustable projections in the breech face the projection making the headspace adjustable (the only part of the gun to be patented). The barrels were fitted to a monoblock at the breech end, while variable chokes were screwed in at the other, full length side ribs were not fitted, a ventilated top rib was optional. The fore-end was fixed. The gun was produced over a period of about 10 years around 1950, it appeared in slightly differing forms but was never perfected. It is thought one or two were made by the a company specially set-up for the purpose, the Fenian Gun Co. Guns bearing this name and that of P V Kavanagh have been seen.
Tim
