Zanzibar 1895 QV 1r Overprint Vertically Downwards, Unique Block

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Description

1895-96 QV 1r green & aniline-carmine ERROR, OVERPRINTED VERTICALLY DOWNWARDS (SG 18j Hall #26).
F-VF/M block of four with the overprint applied vertically between the stamps,
all three impressions of overprint showing small second "z".
Some separation vertically, perfectly reconstituted.
The overprints characteristically faint (attempted removal by printer after mistake was spotted),
under magnification plateable as Setting 3, R2/2-4,
with centre impression (straddling all four stamps!) exceptionally showing variety "BROKEN CAPITAL Z" and "NO DOT TO I".
Fresh, well-centered, vibrant colour.
One of two known blocks (unique with the R2/3 variety) being the largest recorded multiple of the error.
A Zanzibar exhibition showpiece.
Photo-cert: BPA 2018 (no longer present).
Ex Griffith-Jones.
(cv£1700+). See additional image.
The setting which produced this remarkable error was not previously known. What seems to have happened is that a full 12x10 pane, intended to receive the 6x10 setting on its left and right halves, was inadvertently inserted SIDEWAYS into the press - not difficult since a 12x10 pane was almost square - and thus received VERTICAL overprints (mostly partial and misplaced) on six horizontal rows of twelve, or 72 stamps. The other four rows will have completely missed the overprint.