Just found this unopened error black triangle pack in my old card collection. Was considering getting it graded but was curious if anyone could explain what the difference is between a PSA 10 and PSA 9 unopened pack? There's no rips or anything, but the 1999 Base Set Black Triangle Error Booster Pack Set PSA 10 The very first expansion to be released for the Pokmon TCG was Base Set (Expansion Pack in Japan), and in front Pre Order) Pokemon Pitch Black Booster Box Sealed Case MHDEALSPLUS Base Set Black Triagle Booster Pack full artwork set (3 stk.)