I have this Aldo Uberti 1873 carbine replica in .22, it has a nickeled receiver and it is a "dead ringer" of the only original .22 "73" pictures I ever saw .
The thing is. I never saw this in any Uberti catalogs(only .22 version I ever saw was the 1866). I bought it 2nd hand and know nothing about it's past history.
Here it is.
PS. Also have a "normal" Uberti 73 carbine in .44-40. One of these days I will pick it up from the "vault" and take pictures of it.