Sea-Gull M307S automatic wristwatch ST2525 big date & flying wheel

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Your Price: $225.00
Part Number: W-M307S
Availability: In Stock
Diameter: 42mm not including crown
Thickness: 14mm
Weight: 97 grams
Crystal: sapphire
Movement: Sea-Gull ST2525 automatic
  • White dial, silver case, see-through display case back
  • Black genuine leather band installed with butterfly buckle
  • Luminous hour, minute, sub-dial hands
  • Silver hour markers
  • Proprietary Sea-Gull ST2525 decorated by stamped fish scales.
  • Big 2-digit date at 12
  • Month sub-dial at 9
  • Weekday sub-dial at 3

Sea-Gull proprietary flying wheel is located at 6. Sea-Gull researched and developed this type of “poor men’s tourbillon” flying wheel. According to Sea-Gull’s educational advertisement, mounted on the central axis is a flying wheel that has higher mass thus higher inertia. When the machine is running at higher speed, the flying wheel’s kinetic energy increases, absorbing and storing energy; when the machine is running at lower speed, the flying wheel’s kinetic energy decreases, releasing and distributing energy. Thus the flying wheel plays a role to stabilize the pace in the operating process.

Sporty looking M307S, relatively large – 42mm in diameter, 14mm thickness, 97 grams in weight.

Another point worth mentioning is the month does Not move forward by itself after 31 days. If it did it would be perpetual calendar movement costing much more. The month calendar has to be adjusted by pushing the recessed button on the left side once each month.