2c Alaska-Yukon, Imperforate (370a). Mint N.H. top imprint and plate no. 5209 block of six, deep rich color, ample to large margins, typical natural gum bends, Very Fine, the Scott Catalogue began listing this as an imperforate error of the perforated Alaska-Yukon Issue in 2016, in a footnote it states "No. 370a comes from error panes found in perforated stock. Plate 5209 was used only to print the perforated Alaska-Yukon Issue. No. 370a can only be collected as a plate-number stamp or multiple. Without an attached plate number 5209, the stamps from this plate cannot be differentiated from No. 371." -- there is debate among specialists as to whether this truly constitutes an "error" or is simply an uncommon plate number for the normal imperforate issue (No. 371), in either case this is a very rare plate no. 5209 block and especially desirable from the top position, Power Search lists only two other plate no. 5209 blocks offered in our sales, from the right and bottom positions and sold together in our 2009 sale of the "MLG" collection (before the Scott listing for No. 370a), unpriced in Scott

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