Ted,
Great research. I have suspected for a while that Cobb (Red Portrait) was a double print with Piedmont 42. If true, it may well be that Cobb (Red Portait) was also double-printed with other backs. It is easy to imagine a sheet with Cobb (Red Portrait) double-printed on the front that was printed with several different backs, Piedmont 42 being one.
Scot
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