We now have 4 batches of Indian type plates from Bhutan, Ceylon (Sri Lanka), Seychelles and India. All these countries have owner provided plates but all four of these batches look like they have been made by the same machines and that style is incredibly rare and then only seen very occasionally in India itself. In Bhutan, all plates are painted or made from plastic and all these plates are mint so they can best be described as made-to-order specials to part collectors from their money. I guess these were all made in India somewhere.
There are other, similar, so-called Bhutan plates with different registrations that are part of this batch
I believe all originated from American Ebay plate dealer stanwa who is now lerosier1945.