Ebay seller na201 from Pattaya in Thailand is selling these and many, many other fakes. Plates in Thailand are owner provided and shops in every town will sell you whatever you want.
These are just a few of his fake plates. These are all supposed to be from 3 wheeled motorcycles (tuk-tuks) used commercially. The ones from the 1970 series are the wrong colour and the ones from the 1997 series have the wrong vehicle class letter on them.
Cheap junk to fool collectors and part them from their money.
Remember, do not buy mint Thai plates unless you are an expert on the colours, class letters and use of these plates.