Otaku
Active Member
Based solely upon the names of the sets, yes, Platinum really was a separate block.
Diamond and Pearl
DP Mysterious Treasures
DP Secret Wonders
DP Great Encounters
DP Majestic Dawn
DP Legends Awakened
DP Stormfront
Platinum
Plat Rising Rivals
Plat Supreme Victors
Plat Arceus
I stand corrected; I looked up images of the boosters (of which I purchased very, very few) and I see now that I was mistaken.
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This makes the set block prefix even more unwieldy.