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Seagull
Seagull's complicated automatic caliber featuring moonphase and day-date displays in a single movement. At 6.8mm thick it accommodates the additional moonphase disc mechanism atop the base automatic platform. The 27-jewel count reflects the added complexity, and the moonphase display adds a touch of haute horlogerie to watches priced in the budget segment. Represents the most complicated mass-produced Seagull movement currently available.
MoonPhase Master collection · 9 watches








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The Seestern MoonPhase Master Automatic S437.05 is noted for its use of Seagull movements and the brand's generally good quality. One owner observed the watch shares its case and numerals with existing models, with the addition of a moonphase and GMT contributing to a thick profile. Overall, owners rate the Seestern MoonPhase Master Automatic S437.05 positively for its value proposition, despite concerns about its thickness.
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