Glycine Watch Airman DC-4 Vintage GL0071. Whenever the subject of aviation comes up, the name of Glycine is mentioned as one of the pioneers of watchmaking for pilots and frequent travellers. Beginning in 1953, Glycine watches started production of the Airman, a watch that became legendary for introducing multiple time-zone watches to the market. Since then, Glycine watches have developed an unbroken chain of aviation watches, ranging from successively more complex world timers to unique collectors items.