Yes, good thinking. If you can obtain a copy of Crudgington & Baker's book The British Shotgun Volume 1 Page 33 shows a very similar gun made by Lancaster. It must be remembered that Harris Holland did not make shotguns at that time but retailed them from his tobacconists shop business. He moved to 98, New Bond Street and at the time Lancaster inhabited number 151 New Bond Street. I would be of the opinion that Lancaster made your gun. Lancaster at that time was considered one of the best barrel makers in London. I note that your gun was only ever proved for black powder and if the chambers are indeed 2 3/4" then they will have been lengthened at some time. Be cautious if this is case as they may have been weakened. Lagopus.....
