Diamond Dan please check the date code again. As Wolf stated the earliest production of a Uberti 1860 Army is around 1963. The Centennial 1860 Army was first produced. At this time the earliest 1860 Army I have information on was imported by Replica Arms and supposedly manufactured by Armi San Marco. XXVI is 1970, not 1960.
This is the first time that, Republic Arms, Dayton Ohio, has come to my attention. It, of course, is no longer in business but, possibly, there are some interesting ties between Davis Industries and a Republic Arms in Chino, CA. This is some more of that great mystery that surrounds the replica revolver industry.
Is it possible to get a picture of the Republic Arms Dayton Ohio markings?