Natal 1882 QV Imperf Colour Proof Blocks of Twelve

1882-89 IMPERF PLATE PROOFS (more recently described as being De La Rue sample colour standards) of 1d, 3d & 6d (SG 99, 100&103). The complete series of three in matching CROSS-PANE, MARGIN-TO-MARGIN BLOCKS OF TWELVE each ovptd CANCELLED. Some light tone spotting on reverse as usual on these. VF, most attractive. Rare multiples thus.