Hey Andy -
In short, because the known poster cuts are generally the same size as the regular cards. Are they all 100% exact? Nope. Out of curiosity, I just pulled out my poster card and a regular card, and the poster card is about 1/16" of an inch larger. Both are entirely legitimate cards. They are generally about the same size but ever so slightly different.
That, of course, is very common. 1/16" is a minute amount in pre-war card standards. Could a different card be an additional 1/16" off? To me, quite easily. Especially when you consider the variances in even pack-issued cards. T206s, for example, easily vary by that much -- sometimes more than that.
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T201 (50/50)
T205 (208/208)
T206 (520/520)
T207 (200/200)
E90-1 (118/121)
E90-3 (20/20)
E91A/B/C (96/99)
E93 (17/30)
E95/96 (26/55)
C59-61 (149/248)
N28/N29 A&G (84/100)
1901-02 Ogden Tabs (1,327/1,560)
1933-41 Goudey (265/478)
1939-41 Play Ball (381/473)
Complete: E47, E49, E50, E75, E76, E229, K4, N88, N91, R136, T29, T30, T38, T51, T53, T68, T73, T77, T118, T218, T220, T225, W512, W513, W542, W552, W565, Dozens of smaller uncategorized sets
Founder:
www.prewarcards.com
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