Glycine Watch Airman N.1 The Chief GL0251. Whenever the subject of aviation comes up, the name of Glycine watches is mentioned as one of the pioneers of watchmaking for pilots and frequent travellers. Beginning in 1953, Glycine started production of the Airman, a watch that became legendary for introducing multiple time zone watches to the market. Since then, Glycine has developed an unbroken chain of aviation watches, ranging from successively more complex world timers to unique collectors items.