Thanks guys. The 1968 ship date fits for the Model 60. It is one of four that I acquired that were engraved by REI Engravers from Park Forest, IL - Robert E. Izenstark (Bob). The other three are from 1969. REI was in business from 1968-1973. The engraving was likely done by Japanese engravers hired during this period. This one and two others are attributed to Hiroo Sugaya. The grips are by Jerry Evans.
I've posted it in the past, but here's a pic so nobody will holler.
