The Seagull ST3600 is a manual-winding mechanical movement, based on the design of the Swiss ETA/Unitas 6497-1. Known for its robustness and smooth operation, this movement is favored for pilot watches, dress watches, and custom builds requiring a large, classic hand-wound caliber.

Specifications:

• Manufacturer: Tianjin Seagull Watch Group
  
• Movement Type: Manual Wind (hand-winding)
  
• Frequency: 21,600 vibrations per hour (3Hz)
  
• Jewels: 17
  
• Power Reserve: Approximately 48 hours
  
• Diameter: 36.6 mm
  
• Height: 4.5 mm
  
• Winding: Manual, crown-operated
  
• Accuracy: ±15 to ±30 seconds per day (typical)