1947: Quezon-Roosevelt airmails

The first airmail issue of the Republic era came out on August 19, 1947 honoring President Manuel L. Quezon and U.S. President Franklin D. Roosevelt.

Quantities printed:
6c green (600,000)
40c orange (400,000)
80c blue (300,000)

Printing method: Engraved
Printers: American Bank Note Company
Perforation measurement: 12
Unwatermarked paper

If not stored properly, the 40c is prone to oxidation; the orange ink turns to brown and eventually to black.

[Data taken from various sources.]