FLYWHEEL · M171S

Brand: Sea-Gull (海鷗). Reference: M171S. [Version: sector subdials, date and day of the week. View other versions →]. Official retail price: CN ￥3,400

The rotating part at 6 o'clock looks like tourbillon but it's not. Retrograde date hand at 10 o'clock, day of the weeek at 2 o'clock.

MOVEMENT
Mechanical, self-winding. China Made. Caliber: Sea-Gull ST2504. Functions: Hour, minute, second, date, day (Central hour, minute and seconds hands, date hand at 10 o'clock, day of the week indication at 2 o'clock.). Jewels: 38. Frequency: 21600 vph. Power reserve: Around 42 hours.

CASE
316L stainless steel. Diameter: 40 mm. Thickness: 14 mm. Lug width: 21 mm. Water resistance: 5 ATM. Weight: 95 grams (the whole watch including strap). Luminescence: No lume. Crystal: Sapphire crystal. Case back: Screw-down notched. Transparent. Hands: Thermal-bluing steel hands. Regrograde date and day hands. Crown: Push-pull. Pumpkin shape. Signed with the "S" logo.

STRAP
Black. Leather. No quick release: Need tool to remove strap from case. Fit for case lug width: 21 mm. Clasp: Butterfly clasp. Stainless steel clasp.