July 1st, 1955
Non Addressed First Day Cover 
Very Mild Wrinkling If Any which is very very common due to the natural age of the cover/s.

1955, July 1.  50c Airplane (Facing to the Left), Blue on light greenish-blue.  
AEROGRANNE / AIR LETTER No Overlay, Not Postmarked. 
Philippine Bureau of Printing.  (500,000)

Please be aware I've scanned the group for simplicity and the image is one in the group, and I'd consider it a stock photo.
I will send the same conditional FDC if not better from the group. They're all in XF condition. 

International Registered Mail