May 1, 1948
1947 Bonifacio Monument Definitive Issue Overprinted 'O.B.'
10-Centavos Red-Orange
13mm Overprint

Base Stamp Engraved by the American Bank Note Company, USA
Overprinted by the Philippine Bureau of Printing
Printed in Sheets of 400, Separated into Four Post Office Panes of 100 Subjects (10 x 10)
Plate Number: 1-20313
Printed on Unwatermarked Paper
Perforation: 12
Quantity: 9,499,500

O51a
(From the Collection of Dr Ngo)

Overprint Shifted Right 13mm
'B' of 'O.B.' Cutting Through Vertical Perforations

O51b

Overprint Shifted Right ??mm
Creating 'B.O.' Overprint Instead of 'O.B.'

O51c
(From the Collection of Dr Ngo)

O51d
(From the Collection of Dr Ngo)

O51e
(From the Collection of Dr Ngo)

Overprint Shifted Downward 10mm
Only Know Postally Used from Iloilo City

O51f