Just an FYI:
Only all the English 1st edition Base Set Holofoil Rares have both thin and thick stamps available.
Almost all English non-Holo 1st edition Base Set cards are thick stamps, although some non-holo thin stamps exists as misprints.
All 1st edition cards outside of the Base Set are only thin stamps.
All 1st edition cards in other languages, even for the Base Set, are only thin stamps.
1st edition stamp variations article.
Greetz,
Quuador