Posted By:
fkwThe Old Mill overprint cards are just print errors, not a legitimate back variation.
The overprint is a Sweet Caporal 150 series Fac.#649 overprint red bar accidentally put on an Old Mill back at the printers. The "double overprint" is because the sheet was flipped and printed 2 times with this Sweet Caporal Fac.#649 bar. Some newbie at the printers got confused or was practicing.
I dont own these........
