Beschreibung : KH-9 (Keyhole-9), also known as Hexagon or inofficially as "Big Bird", was a large reconnaissance satellite to replace the earlier KH-4B Corona satellites.
The McDonnell Douglas manufactured Mk.8 return capsules were of a similar type as in the earlier Corona satellites and were designed to deorbit a film capsule from space with mid-air recovery of the returning capsule by a specially equipped aircraft. The lifetime of the satellites increased from 40 days in the beginning to up to 275 days during the final missions.
Big Bird satellite and Vandenberg post stamp.

USA 524 - picture enhanced ?

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KH 9-01 · aka BIG BIRD, HEXAGON 1, SAMOS (SATELLITE) · TITAN 3D