Quantities that make for playable poker sets - two to four hundred - come up maybe once a month or so. Paranoid chips come up for sale on eBay all the time, but almost always in small lots - ones and twos, dozens, almost always less than a hundred. We could know better by reviewing sales and marketing materials from the chip makers over the years I know some people have done that, but I don't know what conclusions they've drawn about Paranoid chips, if any. I suspect they stopped being made about the time that Paulson, Burt, and TR King started making modern, edge-molded, printed inlay chips for legalized casinos in Nevada. I don't know how well we can pin down the dates of manufacture beyond 'early to mid 20th century'. Here's a couple of examples from early advertisements: Some of the most common seem to be Crescent Moon and Star, Fleur de Lis, Iron Cross, Clover/Shamrock, and of course letters for people's initials. They were made featuring a wide variety of symbols. These kinds of compression-molded inlaid chips are the forerunners of the modern casino clay chips we know and love. USPCC and Burt manufactured chips that were sold by many different distributors and retailers under their own name, including Mason & Co. Chips of this type were manufactured by the US Playing Card Company, and possibly some other competitors or successors (such as the Burt Company) but I'm not certain about that. More generally, they're compression-molded inlaid chips with die-cut inlays: complex shapes cut out from a single piece of colored material, as opposed to circular inlays with a full-color printed design.

Paranoid might be the brand name of the material that they were made out of, or it might be the brand name of the chips themselves - I've seen claims made that it's the material, but I haven't seen a good source to back up those claims.

As said, those sorts of chips are known as 'Paranoid' chips.

Wooden aa poker chips