ST1780 movement (TY2714)

 

The Sea-Gull ST1780 (also known as the TY2714) is an automatic mechanical watch movement produced by Tianjin Sea-Gull Watch Group in China. It belongs to the reliable Sea-Gull ST17 family and is widely used in affordable mechanical and dress watches, such as models from Sugess and vintage-style pilots' or field watches. [1, 2, 3]

Key Specifications

Type: Automatic mechanical movement with hand-winding capability. [1, 2]
Jewels: Typically features 19 to 28 jewels depending on the specific sub-configuration. [1, 2, 3]
Vibration Rate: 3 Hz (21,600 vibrations per hour / 21,600 BPH). [1, 2]
Power Reserve: Approximately 35 to 42 hours. [1, 2]
Size: 12 1/2 lignes (approx. 28mm diameter). [1]
Complications: Supports a small seconds sub-dial, a date indicator, and a power reserve indicator. [1, 2]

Design and Features

Complication Layout: The movement is distinct for powering multi-sub-dial or classic dress watch layouts, commonly featuring a small seconds hand, a power reserve meter, and a date display. [1, 2]
Date Adjustment: Many watches utilizing the ST1780 use a specialized pusher or recessed adjustment tool (often accessed via a small corrector button or pin near the crown) rather than a standard quickset crown position. [1]
Rotor and Winding: As noted by enthusiasts on WatchUSeek Watch Forums, the automatic rotor can be noticeably audible when moving, giving the wearer tactile and acoustic feedback of the winding action. [1]
Aesthetics: Frequently displayed through exhibition casebacks, the movement is often decorated with basic striping or perlage by Sea-Gull to elevate its visual appeal in budget-friendly mechanical timepieces.

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