The bicolour series. SG113, the rare Harrison printing, unmounted but toned.
Cooke printings have sharply-defined edges to the central black vignette. The Harrison vignette tends to just peter out at the edges. Another Harrison feature is what I call the “Northern Lights”, a dappled blotchy appearance to the sky with lots of pockmarks - examples are circled in orange on the detailed scan of the bottom stamp, identifiable as #13 by a “rift in sky” flaw.
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