Besides the rounded - no panel feature, there is the very utilitarian single escutcheon 'nut,' the hardware which looks very NY, to me, single wedge (though most I've seen used a pin,) probably no half cock and only fires if the trigger is set, cast in-place pewter nose cap and looks like it may have an ever so slight perch belly along the bottom lines of the stock. I think used barrels were more the norm than we realize. Most of the barrels in NY pieces I've come across were re-purposed. And scary thin through the lock bolt area. Yep... NY
Cap box added later, sometime? Any patina to the brass on the interior of the box? At a minimum, I think someone went out of their way to index the screws. Who knows.
Still, a nice clean piece.