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J LevineSealtest are stickers and are a 1/4 of an inch bigger side to side. Same height.
Lummis came with an ad on the back for free baseball tickets.
Lummis are exceedingly difficult. Sealtest are tough but not impossible.
Both use the same photos and checklist but there may be a little bit of a cropping difference (due to the size difference).
As far as I know, Lummis were not issued with sticker backs.
Joshua