Redoak, reference the above. I have a Tolley 2" and Skimmin & Wood bought their name sometime before the gun was made. The barrels of mine are marked 'JA' too so he probably did work for them. Most English guns are a product of a group of outworkers. 10 to 1 your guns mentioned were Skimmin & Wood's. Henry Monk's are still in business in Chester as far as I know and may be able to shed some light upon the origins of your gun. Lagopus.....