3c Z. Grill, Thorp Patent Experimental Trial Color Essay + (No Value) Z. Grill, Essay on Tinted Paper (85C-E2 var., 85C-E2).
Combination block of six on Salmon paper, top four 3c stamps are No. 85C-E2 var., bottom two sheet margin stamps are No. 85C-E2, original gum, h.r., Very Fine and choice, ex Geisler, this block is 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, for some reason the Scott Catalogue lists the 12c Z Grill essays (as 85-E1) but no longer lists the 3c, which are of the same nature (and at one time were listed as 79-E15q), Scott Retail as six No. 85C-E2
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