Up until 1988 Joss (east) used to put the joss logo on the collar along with the Year (example Joss 1985). And from what I can remember it started in 1983-88. In 1989-1990, just the word JOSS was engraved on the collar. After 1991 the JOSS logo was stamped in the butt cap of each cue for a few years. Prior to 1983, I really do not think, Joss had there name on any cue. You could email Joss cues and they are pretty good at responding.
I have owned mostly Joss (east) cues prior to 1989. Great construction, play and feel. Back then it seem they really put alot of thought and design into there cues. Also, back then up until the early 90's, Joss (east) sponsored both Mike Sigel and Nick Varner.