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Surnames: O

O'Hara, M. J. UK Bankers' Mail Services in the 20th Century [L] 44(1)4

Oakley, D. H. 'Ess' and 'Eff' [N] 26(5)99

Oliver, R. H. 1d Red Plate No. 1291 [N] 23(4)64

Osborne, H. 1840: Easy Plating [L] 1(6)68

Oxley, G. F. Coloured Numeral Cancellations (1/4) [M] 6(10)170

Coloured Numeral Cancellations (2/4) [M] 7(1)10

Coloured Numeral Cancellations (3/4) [M] 7(2)26

Coloured Numeral Cancellations (4/4) [S] 7(3)40