September 18th, 1947
No Return- Addressed First Day Cover/Air Letter
No Postmark
Very Mild Wrinkling If Any which is very very common due to the natural age of the cover/s.

1947, September 18.  20c DC-4 Skymaster, Red (Shades) on Bluish-green.  
AIR LETTER with "+ Philippine Foreign Airmail +" Overlay.  Philippine Bureau of Printing. (500,000)

International Registered Mail