What you have to remember about all these E121-like sets is that they are very much like the T205 or T206 set (or even the M101-4/5 or E135/H801-8 family of sets), but for some reason we don't think of them like that. As in those sets, there are many different backs... all of which were produced by the same people but the difference lies in what is (or isn't) printed on the backs. It would make more sense for the printing company to use the image/card they had already designed for say Dave Bancroft for example than to design a brand new image or change anything for a new client (in this case Koester's). For players they hadn't already made yet the image was designed from scratch and those are the exclusive cards I was talking about. I am really close to developing a rough time line for most of the E121-like backs. These Koesters cards were produced in 1921, after the initial printing of the E121 Series of 80 set, but before the Series of 120 which was a 1922 production. These sets began w/ the first series of Holsum Bread cards (a 1920 issue) and ended with the later printings of E121 series of 120 and the W501 set-- so from 1920 to late 1922.
-Rhett
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