Looks to be a typical Uberti made, Navy Arms Reb 1860 "Griswold and Gunnison". Made in .36 & .44 caliber with 5 1/2" or 7 1/2" barrel.
Not a Dragoon, yours is about the size and weight of an 1851 Colt Navy.
Looks to be missing nipples... you should be able to order some if you want to shoot it.
Do not think it is unfired based upon pictures, powder residue & corrosion. Give it a good cleaning & oiling...to disassemble you can tap the barrel wedge loose from the side opposite the wedge screw.
In a "perfect world" you do not have to take the wedge out of the gun; just get it loose until the wedge screw's head holds wedge from falling out.
The barrel is likely well stuck on the frame. To help remove it, once the wedge is tapped loose, place the hammer on half-cock, rotate the cylinder so that you can use the loading lever to push against the cylinder and hopefully push the barrel away from the frame. May need to use a penetrating oil to help free things up.
Congratulations on getting a super bargain!
:thumbsup: :hatsoff: