I've also wondered about the E92 set and why three distinct brands (I'm grouping Croft's and Crofts and Allen as one) were all part of the same set.
Regarding the D355 I doubt they were ever widely distributed. They are no more than an E102 back with an overprint stamp, suggesting that their supply was very limited. Also, given the recent overprint fiasco, that's another card that one would need to be really careful about.
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