SG371 1913 2½d. Cobalt blue, very fine, original gum C13 strip of 3, overprinted SPECIMEN type 26.

£695.00

Mounted on stamp 20/3 only. Produced as a colour standard for the first Harrison printing. Unique control piece. Spec N21u (corner pair unmounted).

SKU	339052
SG Number	SG371

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