This is a 1924 German airmail stamp (Deutsche Flugpost) issued during the Weimar Republic. The design features a stylized winged globe with rays, symbolizing the progress of aviation and global communication. Printed in brown with yellow-gold details, it carries the denomination of 25 Mark, a high-value issue often used on international airmail during the inflationary period. These early airmail stamps are highly collectible due to their distinctive Art Deco-inspired design and historical significance in the development of air postal services in Germany.