1948, May 1. O.B. (Official Business) Overprints on Pictorial
Issues
American Bank Note Company (ABNC) (10c); Philippine Bureau of
Printing (PBP) (4c, 10c). Perf 12
Singles,
Sheets of 100
4c Rizal
Monument O.B. - Singles (14,998,500)
10c Bonifacio Monument O.B. - Singles (5,999,500
- PBP), (2,500,000 - ABNC)
First Day Covers: Manila (Known printed
cachets)