I thought the 'New Army' and 'New Navy' Revolvers, had Barrels which met the Frame with no 'Boss'...no 'swell'?
The Barrel diameter did not graduate into an enlarged aspect, where it meets the Frame...
This Barrel has the 'boss' or 'swell' associated with a later era, long after New Army or New Navy had ceased production.
Were replacement Barrels made in the 'later' Style, for use on the New Army or New Navy? ( even as one sometimes sees post War replacement Barrels, for the New service, which are different than the pre-War Barrels in some ways ).
Otherwise, I have never seen an 'Army Special' which did not say 'Army Special' on the Barrel, right there with the Cartridge designation Text.
So, this is rather mysterious!