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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.
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MoonPhase Master collection · 9 watches








4 colorways
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Owners widely praise the Seestern MoonPhase Master Automatic S437-2 for its exceptionally bright BGW9 lume, described by one owner as glowing "like a lightsaber," and its legible sub-dial. The watch is noted for its attractive blue and gold dial, and the moon phase complication is appreciated as a visual feature. One owner reports an accuracy of +5 seconds per day with 285 amplitude, which is considered acceptable for the price and Seagull ST2528 movement. The Seestern S437-2 shares a design language with some luxury brands, with its moon phase models drawing comparisons. Overall, owners rate the Seestern MoonPhase Master Automatic S437-2 highly for its impressive lume and build quality at its price point.
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