It's more than a little surprising that the guys at Julia's can't figure out who made it. Clearly they have some good guys on staff, plus my guess is they consult people outside. So what gives?
I really want to say Lefever, because it has more of those attributes than Parker. But I still can't, because:
1. Those breech balls don't look like Lefever relief engraving.
2. The bottom of the frame bears no resemblance to Lefever.
3. Uncle Dan knew that the proper place for the rifle barrel on a drilling was THE TOP, so you could aim the damn thing.
Also, I am not aware of any Uncle Dan guns which bear NO attribution whatsoever. No grade marking or serial number yes, but never NO maker attribution.
I don't know Parkers well enough. Dis Parker ever produce any guns with more than two barrels?
Very strange.
-- Nudge