Like Rocketman said, the forearm shows lots of use (checkering worn to the nub). Add replacement barrels, Id wonder if not at least a bit tired, if not more so. Id want to examine that gun closely before I jumped in. A lot would depend on the price for me. As a side note, I once asked David Trevallion what he thought about Henry Atkin guns, and his response to me......theyre old.
Not sure what that means.
When Dale Tate examined my 1930 Atkin lightweight self opener he was ecstatic over the condition and quality and felt that the resale value would be north of $20K... far more than I paid for it a couple years ago. I don't know how optimistic his estimate was.
As far as "old" goes, Atkin made guns until about 1960 - forget the date when they merged with Grant & Lang, et. al.