I know McDaniel built 4 point 4 veneer cues with maple block rings just like that. Not sure he inlayed notched diamonds though.
That ring work was used in Mali cues with 5/16-18 piloted steel joints.
Someone should be able to ID it based in the phillips head weight bolt and buttcap.
That is definately something nice, gotta be late 70's.
How does it play?
Some one is sure to know who made this cue. One more time to the top