Sweet! Caliber?
It is 45 Colt.
I have owned several Uberti revolvers over the years and currently have around ten or so and this is the finest fit and finished Uberti I have owned. Now mind you I have not owned some of the higher end one like the Evil Roy but I have friends who do and like I said I have seen no better fit and finish. It is no USFA but it is really close to my Standard Mfg. (I said close

). I have not had it apart yet so I don't know what the internals look like but that will change when my hammer kit comes in.
Also, this is a Stoeger and not a Cimarron.