I agree very old seasoned wood is best, but how good was the glue back then?
Honestly it all depends upon how / where the cues were stored. Even today many cue makers are still using wood glue to glue up veneers. While epoxy is certainly stronger if also makes the colors bleed depending upon who made the veneer's, wood glue or Horse glue as it was known years ago is still the glue of choice
I have done a number of conversion cues, and the only time I have ever had a problem with cues that had been stored outside or exposed to some kind of moisture. If the cue is solid before you start the conversion process turning it down over time has little effect at least from what I have experienced.




