The Joss logo with the italic J dates the cues 1968-1972 100%
The hoppe cue is 1973
Here is an example of what Bob is referring to.
The photo on the left was taken from the Joss website from the Diamond series.
The photo on the right is from Leon's photos.
Note the difference in the style of engraving (even though the pix on the diamond did not hold up too well).
Of particular note, the "J" on the Diamond series cue is crossed at the top, and it is not on the cue in Leon's pic.
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