Lot 1516
BK
3¢ deep violet, booklet pane (720b, BK84a), two panes in 37¢ booklet, violet on buff with experimental cellophane interleaving, panes original gum never hinged, slight cover wrinkle at top left. Extremely Fine and scarce.
Scott $1,750
30,000 booklets of no. BK84 were made with .001 inch thick cellophane similar to but thinner than the experimental interleaving used for BK80a. Poor handling during assembly plus higher cost prevented wider use and very few were saved.
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