£15,000 - £20,000
1910-13 ½d bluish green, lower marginal block of four with full imprint, error IMPERFORATE, unmounted o.g. From the sheet discovered at Umtali by H. Benson, with typical slight imperfections (vertical crease, marginal adhesion) but almost certainly unique in this positional form. SG 120a, RJL 5 imperf Ex 'Besancon' (Corinphila 19 Nov 2021, lot 10071), Arthur V. Jacon, and Tommy Allen
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