Also, they're not perfect, you can see some minor cracks around the zillion inlays.
That would be expected for cues that old and not stored with museum quality climate control. It's natural materials (even the glue) and time has a way with stuff. Wood dries, shrinks and expands.
I have a rocking chair I picked up for $15 that needs the legs re-glued that has similar inlays in the back. It's not perfect, but that's because it's hand done and not cnc inlays. It adds to the charm. I have to do some more studying on how to properly glue up the legs... future project. I'm not ready for the rocking chair quite yet!
You definitely have some neat historical cues. No idea if they are valuable in their current state, but they sure are a cool thing to look at. There was some real work that went into those.
Even though the butt is thick, I doubt you could do any turning on them with a lathe as the inlays are most likely quite thin. Someone could probably match a shaft to them, or someone talented could splice a shaft onto them. Look through those sites that were posted in the thread already, some of them have different woods like ebony or mahogany spliced into the shafts. Some of the splicing is quite intricate like a butterfly cue. That would probably be the route I would go, however something about putting a modern shaft on them tickles my brain in a good way. It would be absolutely historically wrong, and I'm sure some would tar and feather me for even suggesting it, but it sure would be a unique playing cue.
By the way, thanks for posting these, we really enjoy seeing this type of thing!