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quanhey jim i put the value of blue crofts about 3x over a regular black back, not sure about the red as leon has sold only one so we have to go case-by-case on those.
i never collected the dockmans (common backs/cartoony lithos) but they would fall in the e95/e93 in term of scarcity. since e92s/e101s/e102s were all printed at the same time/place i would guess just like the other 2 sets some e92s are harder to come by.
i'm sure if u email pete he can give you better info as he's been collecting the set for years.