Originally posted by newtron25
Don't know why they'd drill holes on top and bottom of egg - that might be a dead give away to a stone lathe, i.e., modern tools.

An intriguing piece.
As a somewhat amateur machinist with a fairly well equipped shop, the holes may have been sized for use in a lathe.
Lathes are a fairly old invention that go quite a ways back in history.
The larger hole indicates a short mandrel that drove the egg shaped stone.
There would have been an extension of the stone so as to set up a "dog" for driving the stone.
The extension would have been taken off after the egg shape was complete.
(A common operation when turning metal or wood.)
The end with the small hole looks/sounds very much like a dead center was used.
Again with an extension due to the hole would wear somewhat fast.
That possibly due to they may not have had live centers available at the time the egg shaped piece was turned.
A live center has bearings and the center point turns with the workpiece.
A dead center does not turn and a lubricant is used to keep the workpiece from damaging the hardened center as well as keep the center hole in the
workpiece from enlarging.
I'm guessing the stone wasn't overly hard due to the carving was done by hand.
I wonder if microscopic inspection would show minute particles of steel?
Thanks for posting.
And for Byrd, thumbs up as well.
Your posts and replies are always well thought out, interesting and well written.
A nice change from some of the shrillness that goes on around this place....