The E92 backs all advertise brands or products, much like all the T206 backs. The E101 and E102 do not. They even specify different sets, one of 25 (actually 29 if I remember correctly) and one of 50.
I think the E92s should probably be classified as distinct sets, but I do not think E101 and E102 should be lumped into the same pile. I think Burdick's separation makes sense.
But those aren't the only sets we could be discussing here. E105 and E106 share many similar fronts.
JimB
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