just checked my 17 base set 1st ed holos, 12 are thick, 5 are thin, pretty cool, never thought to check that out.
I never realized the 1 inside the circle was different. I always assumed the first one you show in your pic was the āthickā one because the font looks thicker/darker lolā¦ always good to learn something new 
I first thought that too since the stamp looked bold 
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That looks like an aftermarket stamp for a couple reasons but I couldnāt be sure without seeing a clear picture:(
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blarh, I remember this confused me when I first started collectingā¦ why does the thin print have thicker edition stamp writing, and why does the thick print have thinner edition writingā¦ grrrrr
yeah, and I think Iāve seen some thin commons etc around.
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would be weird if it was, got about 500 base set 1st ed from the same seller in 2011, and only a few have the different looking stamp, they look legit to me
anyway, just took a pic of two of my voltorbs, can see the stamps pretty clear
s1255.photobucket.com/user/acebren/media/IMGA0949_zpstd5bnbld.jpg.html
to me it looks just like the two examples of thin stamps on commons and uncommons that weāve seen
here are two pictures of a rattata ive got
i1255.photobucket.com/albums/hh640/acebren/IMGA0950_zps2tygfe4x.jpg
i1255.photobucket.com/albums/hh640/acebren/IMGA0951_zpsccapaewv.jpg
all opinions are appreciated,
I think these pictures show that these cards are real thin stamps
and here is a dodgy paint job (lol) done to compare my rattata to the full heal that is verified to be a thin
i1255.photobucket.com/albums/hh640/acebren/IMGA0950_zpspjkbi4gj.jpg
yeah confused me also, but iāve found the meaning of thick is a bigger ā1ā, and thin means the ā1ā is smaller,
so its referring to the ā1ā, not the stamp itself