on piece 1891 6c. in red on 10c. on 4d. mauve and 6c. in black on 10c. on 4d. mauve, both with variety "6" and bar inverted, neatly cancelled "O" in oval of bars and used on small piece; scarce. S.G. 43a, 44a; £1,025. Photo

Details
on piece 1891 6c. in red on 10c. on 4d. mauve and 6c. in black on 10c. on 4d. mauve, both with variety "6" and bar inverted, neatly cancelled "O" in oval of bars and used on small piece; scarce. S.G. 43a, 44a; £1,025. Photo