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The Seagull ST2108 is an automatic, single‑date moonphase movement based on the reliable ETA 2824-2 platform. It drives central hours, minutes, and seconds, a pointer date, and a true 29.5‑day moonphase display at 6 o’clock. This high‑beat movement (28,800 vph) offers a practical and affordable complication module for dress watches.
True Moonphase – Uses a 59‑tooth gear for a 29.5‑day cycle, not a simple day/night indicator.
Central Pointer Date – Date is indicated by a central hand pointing to markings on the dial perimeter.
High Frequency – Runs at 28,800 bph (4 Hz) for a smooth seconds sweep.
Bi‑directional Automatic Winding – Self‑winds in both directions via a ball‑bearing rotor.
Independent Adjusters – Two recessed pushers (at 4:00 and 8:00) adjust the date and moonphase separately.
| Parameter | Value |
|---|---|
| Caliber Number | Seagull ST2108 |
| Base Caliber | Seagull ST2130 (ETA 2824-2 clone) |
| Movement Type | Automatic, self‑winding mechanical |
| Diameter | 26 mm (11.5‴) |
| Height | 6.62 mm |
| Jewel Count | 21 or 26 jewels (inconsistency exists) |
| Vibrations Per Hour (bph) | 28,800 (4 Hz) |
| Power Reserve | ~41 hours |
| Rotor Type | Ball‑bearing, bi‑directional winding |
| Hand-Windable | Yes |
| Hacking Seconds | Yes |
Replacement movement for watches needing a moonphase complication.
Ideal for dress watches, including the Sugess Moonphase Master and various Seagull models (e.g., 819.12.6136).
Suitable for custom watch builds requiring a true moonphase with date.
Q1: Is this a genuine Seagull movement?
A: Yes, it is an original Seagull‑manufactured caliber, not a generic clone.
Q2: Does it have a true moonphase or just a day/night indicator?
A: It has a true, 29.5‑day moonphase driven by a 59‑tooth gear, making it a genuine complication.
Q3: How do I set the date and moonphase?
A: Use the recessed pushers: the 4:00 pusher advances the date, and the 8:00 pusher advances the moonphase. Avoid adjusting between 23:00 and 05:00 to prevent damaging the mechanism.
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