Recently, I've been working on some Baltimore Orioles master sets from the junk era.
In 1990 and 1991, Fleer issued cards with U.S.A. (with a period at the end) and U.S.A (without period at the end)
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Not much value, but if you have any of these Orioles cards, I would be interested in purchasing them. All are no period variations.
1990 Fleer (no period) - 172, 173, 174, 176, 177, 178, 179, 180, 181, 182, 183, 185, 186, 188, 190, 191, 192, 194, 634
1991 Fleer (no period) - 467, 470, 471, 472, 473, 475, 477, 478, 479, 480, 482, 483, 485, 486, 488, 489, 490, 491, 493, 495, 496