I'll start by saying that I have been collecting the "E121" Family of sets for a few years now. Everything from the Holsum Bread cards to the W501 strip cards (all of which share the same front format). My E121-like collection can be seen on the following page.http://www.starsofthediamond.com/e121.htmlYour question about the E122 set is a good one, and an accumulation of 32 differen E122's is fairly impressive. The E122's are indeed tougher than your average E121 card, there are some tough E121's from each of the sets that dont come up for sale too often though. What many don't realize is that the E122 set appears to have been made from using the E121 cards that the American Caramel Co. had made and rephotographing them with simply adding a new frame around the old card. See photos below... It is my theory that the E122's may have been made during the transition from the E121 Series of 80 to the E121 Series of 120 sets. The following would be a rough guess about the chronology of the E121 sets (all 3 Series of 80 back types, the E122, and the Series of 120 backs). You can see the "transition" from the bottom line on back to the type used on the later E122 and E121-120 sets. The Type 3 E121 Series of 80 is the toughest of all the backs in the picture.Feel free to email directly at rhettyeakley@netzero.com