Is this a Thick Stamp?

[quuador]

Although I agree with @jj1 that it never made sense these are called Thick stamps and the others Thin, it’s as @cullers pointed out too late to change it now, since the terms have already been used like this for over 20 years, ever since the stamp differences were discovered by collectors. We can only curse the one that named it like this all those years ago. Regardless, the stamp on the Mewtwo is undeniable a Thick stamp (wide “1”).

Relevant article I wrote with all stamp variations. I also mention the controversy over the terms there:

Thin Stamp:
… The “1” in this Thin stamp is thinner than the Thick stamps, and the “EDITION” is also thicker. (This also causes some controversy / discussion about the name Thin stamp, and a lot of people think the Thin and Thick stamps should refer to the stamp itself rather than the width of the “1”, which would mean the terms should be swapped. But, it is what it is, and these are known as Thin stamps.)
Originally the names were most likely called “Thick one stamp” and “Thin one stamp”, but over time the “one” part has been removed, leaving the confusing terms we have today when we talk about the stamps.

Greetz,
Quuador