12c Z. Grill, Thorp Patent Experimental Trial Color Essay + (Unstated Value) Z. Grill, Essay on Tinted Paper (85E-E1, 85C-E2).
Two 12c singles with attached grilled selvage, Black and Brown on yellow, the 12c stamps are No. 85E-E1, the bottom selvage are No. 85C-E2, original gum, a few perfs with some slight gum soaks, Fine and scarce, like the block offered in lot 250, these are conclusive proof for the footnote in Scott which states that No. 85C-E2 comes from fully perforated selvage of the 3c and 12c Z Grill essay panes
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