Bechuanaland 1913-24 1s bistre, watermark Simple Cypher, overprinted 'SPECIMEN' (type GB23), left marginal block of 4, SG82s.
A very fine and fresh, unmounted mint block of four with full original gum.
A unique multiple, not previously available on the market in this form.
Provenance: Ex British Postal Museum Archives.
Although distributed by the Universal Postal Union (UPU) with the same 'SPECIMEN' overprint, no blocks could exist from that source.
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