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runscottThe factory 42 backs say "4th Dist. N.C." after the factory designation, which stretches quite a bit further across the bottom of the card. If you see one that you think might be a "42", go look at other t206 scans on ebay and find another 350-460 - if there is not a noticeable difference in the length of the factory designation line, then you are dealing with a common factory 25.
If you want examples of both, just email me for scans.