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PCDid anyone else notice that the scan of the Sweet Caporal back that RobertS provided above shows not only horizontal and vertical back printing, but it also shows TWO DIFFERENT FACTORIES (Fact. 30 and Fact. 42). This demostrates that multiple factory backs were printed in the same run, which I think undermines the theory that the fronts were printed in coils and shipped to individual factories, where the factory-specific backs were then applied.
Obviously, the "floating" Fact. 42 on Robert's card above is an error, but it still shows that multiple factory designations were being printed at the same place at the same time.
I'd be interested to know what backs are on Art's reconstructed strip above.