1860 Colt imported by Replica Arms or Navy Arms.
Replica Arms is the logo stamped on it. Might also be Navy Arms. It would be stamped on the barrel. Could be a transition revolver from when Navy Arms bought out Replica Arms.
Replica Arms was the first importer of the Colt Walker replica made by Armi San Marco.
Most older Replica Arms were made by Armi San Marco, Uberti and Pietta.