I have 2 Mezz cues. The quality is exceptional. Even the thread timing is exactly the same for both when I attach an extension in the butt. Could be a coincidence. But my experience with Mezz is that nothing they make is by chance.
They do that a lot in the Philippines. I've seen their own versions of virtually all popular joint pins. 3/8-10, 5/16-14 and even Uniloc QR that either fit too loose or too tight into standard jointed shafts and joint protectors.
It's a long shot, but you might want to email pool halls like the Hurricane Room in St. Pancras and other branches like Acton. Just to spread the word that you're looking for the cue.