#UC461973 15c Air Post Envelope Hot Air Ballooning
$1.75- $3.20 #UC481974 18c Air Post Envelope, red & blue
$1.75- $3.20 #UC501976 22c Air Post Envelope, red & blue
$1.75- $3.20 #UC491974 18c Air Post Envelope, red & blue NATO emblem
$1.75- $3.20 #UC431971 11c Air Post Envelope - Jet Plane
$1.75- $3.20 #UC441971 15c Air Post Envelope - Birds in Flight
$1.75- $3.20 #UC391967 13c Air Post Envelope, red & dark blue
$1.75- $3.20 #UC44a1971 15c Air Post Envelope - Birds in Flight, "AEROGRAMME" inscription
$1.75- $2.50 #UC551982 30c Air Post Envelope - Made in USA
$2.00