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
Osborne, Mike KGV Royal Cypher 1d 'Dots in NW Corner' Variety [S] 61(5)104
— KGV Royal Cypher 2½d Missing Crown in Watermark [S] 61(4)96
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