South West Africa Official. 1951-52 1½d purple-brown, type 015/16 overprints, top marginal block of 6 (2x3), the centre pair with transposed overprints, fresh original gum. (variety pair unmounted). A scarce positional piece from the 'column' setting with transposed overprints on alternate rows (found on 1½d and 6d values only). Official. SG O25/a
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