Brian, you know I love these sorts of posts. Frankly, I wouldn't worry about the backs. You'd be getting way into the weeds at that point. Yes, the rare ones are collected/desirable. But I'd keep it short/simple like the E90-1 and Frank's T206 thread.
Hope you're well -- and just my two cents.
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T201 (50/50)
T205 (208/208)
T206 (520/520)
T207 (200/200)
E90-1 (120/121)
E90-3 (20/20)
E91A/B/C (99/99)
C59-61 (149/248)
N28/N29 Allen & Ginter (93/100)
1901-02 Ogden Tabs (1,327/1,560)
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
www.prewarcollector.com
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