In fact; it was widely used on samples by Caro-Paris way before they even changed their name. Regarding the thin MOP made in China for the UK and European market, I do not know anything about those.

If there were MOP chips out there that came from where some sellers claim, you would not even know about them in virtually every case.

The two types of MOP manufacture and their embellishment are not connected in any way... and there is a ton of published info on the material that was made in China...