LOB 1st Edition
The game's first English set, released in 2002. It is the undisputed premium segment, and where the gap between a high grade and a raw copy is widest.
Yu-Gi-Oh! is one of the oldest TCGs still running, and its vintage 1st Edition is a well-identified premium segment. Early English print runs combine cutting defects with borders that forgive nothing.
In short
On Yu-Gi-Oh!, the premium grading segment is vintage 1st Edition, particularly the Legend of Blue-Eyes White Dragon set (code LOB), the game's first English set. The difficulties there are twofold: early print runs show frequent cutting defects, and the cards' dark borders make any whitening stand out. Japanese print runs of the game generally show more consistent centering and cutting than their English equivalents, which makes them statistically more favourable to high grades.
The 2002 base holds most of the value.

Blue-Eyes White Dragon
LOB-001 · 2002
The game's signature card

Dark Magician
LOB-005 · 2002
Ultra Rare in 1st Edition

Exodia the Forbidden One
LOB-124 · 2002
Five pieces to assemble

Ash Blossom & Joyous Spring
Maximum Crisis · 2017
Modern staple, heavily played
As with Magic, dark borders turn a micro-chip into a visible white dot. It is the most frequently noted defect on the game.
The first English printings show notable cutting irregularities. They are original, not caused by handling — but they still count towards the grade.
The game's holographic treatments scratch easily and read immediately under raking light. Tilt the card before calling it clean.
High-value vintage Yu-Gi-Oh! is heavily counterfeited. The light test and font comparison against a reference copy are prerequisites.
The game's first English set, released in 2002. It is the undisputed premium segment, and where the gap between a high grade and a raw copy is widest.
Blue-Eyes White Dragon, Dark Magician, Exodia and the game's founding figures. Steady demand, driven by nostalgia as much as play.
Predates the English versions, better cut, but harder to source and authenticate from Europe.
Prize cards, event promos and limited runs: structural scarcity and strong demand for authenticity certification.