Central & South America | 1975 Modern Architecture Mexico Airmail Postage Stamp Mint Never Hinged Green grey and Red

Description

This 20-peso Mexican air mail postage stamp depicts a university building as an example of modern architecture.
Date of issue: 1975
Size: 40 x 25 mm
Colors: Green grey and Red
Emission: Air Post
Perforation: 14 x 14?
Printing: Photogravure
Paper: phosphorescent
Face value: 20 $ – Mexican peso
Mint, never hinged condition.