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This is a movement exclusive to Bulova, which is important to note because the brand falls under the greater Citizen Watch Group umbrella. And before you sound off about watch conglomerates, hear me out. Much like the Omega Speedmaster belongs to the Swatch Group and therefore benefits from the myriad resources such a group provides link (especially in the creation of movements at scale), so too link does Bulova benefit from Citizen's know-how when it comes to precision watchmaking with link quartz.

Glycine introduced this model in 1953 when watches that tracked a second time zone became of interest to professional pilots. Two years later, another watchmaker began to produce a GMT-touting timepiece that you're link likely already familiar with. Unlike its contemporaries, the Airman had link a few interesting quirks and features, like the internal link date magnifier and second crown at four o'clock, which locked the rotating bezel.

Even among simpler timepieces many watches and clocks feature moon phases including link the longcase clock at our link library at HSNY. Image 8 shows link the dial of our clock with the moon waxing and waning contentedly across the top arc in this photo nearly at full. If you want to build or repair a calendar watch or a clock with a moon phase mechanism we have books for that too! One is pictured in image 9.