Cue 343 looks like a Diamond inlay to me... Maybe I'm wrong...
John by the way, thanks for the link it was some good reading. But John no where that I saw unless I missed something did that link or any other I have ever seen show cues with Slotted Diamond inlays that were made before the late 1940's and that was topic of discussion.
I certainly do not know all there is to know on this subject it is way to broad and complicated, but I have never seen Slotted Diamond in lays in any cue that was made earlier than the late 1940's, unless it was a tribute cue that was made much later.
I don't know why this was the case but it appears to be the case even though the Slotted Diamonds were used in Guitars as early as the late 1920's.
So I will make my statement again, and please prove me wrong is you can. But it appears that Frank Paradise started using these inlays in cues in the 1950's and continued to use them until his death. It also appears that Palmer more than any other company started incorporating these into their designs as a regular feature in the early 1960's, most likely because of their association with Frank. Then it appears that every other single Cue maker production or other wise followed suit and the Slotted Diamond because a common inlay for pool cues.
Like I said above if anyone has any information to the contrary of what I said please post it.
Thanks Craig