Posted By:
JimBBill K,
To my knowledge there is only one example of each of the E93 blank backs. They surfaced from the same source as the two sets of E93 uncut sheets (in panels) that were auctioned by Mastro last year. I believe there were 19 total (one of each of 19 different fronts). I have never heard of any other blank back E93s. I think they have been underappreciated to this point.
JimB