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BcDThey do NOT usually come blank backed but if you get a blank backed E-92 I am certain there is a much greater percentage it came from Croft's Candy~.
In 1985 I purchased a pile of them from Rick Kohl and several duplicates in which blank backs were common.................but only common to the group he found in Croft's Candy. ALL the other E-92 back variations did no have nearly as many blank backs- Here is a scan of a few I purchased then- They were 4200 each and the lowest grade for one came back Ex/Mt 6/80.