The lack of barrel threads showing and the lower front sight is highly suggestive of a ASP/Euroarms gun. On a couple of my ASP/Euros I had to order taller front sights as they shot a little high. They also had dovetailed front sights (like Ubertis, unlike Piettas) which made them easy to replace.
Great photo! Did you pull the cylinder pin and look under it for the logo?
With over 15 perCUSSIN' revolvers, I've been called the Imelda Marcos of cap & ball.
SASS#3302 (Life), SASS Regulator, NRA (Life), DGB#129
Wolverton Mtn. Peacekeepers (WA), former Orygun Cowboy (Ranger, Posse from Hell)