Natal 1882 QV Imperf Colour Proof Trio in Pairs

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 each overprinted CANCELLED in horizontal pairs. Tone spots on reverse as usual for these. VF, most attractive.