It's 5/16-18
Yes, it's very nice and in good conditions for it's age.
The cue was in my shop this last weekend. There's no inscription on the silver rings.
Thanks!
The new owner will be getting in touch with Ernie soon. If authenticated, I recommended he have Ernie rewrap it and build an extra shaft.
Very nice thanks for sharing.
The insert was brass.
Anyway, if it's authenticated, it may be going up for sale. I'll be sure post an update.
Thanks again to everyone who commented!