ARCHIMEDES SPIRAL AND PULSEMETER

Brand: Sea-Gull. Reference: 819.13.3011. Launch date: 2022-July-Date? Fat Kong (孔胖子) custom model.

Chinese character:
中国空军 - China Air Force. Positioin: on movement plate, visible through case back.
天津手表厂 - Tianjin Watch Factory. Positioin: on movement plate, visible through case back.

MOVEMENT
Mechanical, manual-winding. China Made. Caliber: Sea-Gull ST1901. Column-wheel chronograph. Functions: Hour, Minute, Second, Chronograph, Pulsemeter (Central hour and minute hands, small seconds hand at 9 o'clock; Central chronograph seconds hand, 30-minute counter at 3 o'clock; Red pulsemeter scales on edge of dial.). No hacking (Seconds hand does NOT stop when crown is pulled out). Jewels: 22. Frequency: 21600 vph.

CASE
316L Stainless Steel. Diameter: 40 mm. Thickness: 14 mm. Water resistance: 3 ATM. Luminescence: No lume. Dial: Off White. Matte finish. Crystal: Sapphire Crystal. Double Domed. Case back: Screw-Down Notched. Transparent. Glass case back. Crown:Push-Pull. Signed with the "S" logo.

STRAP
Black. Cowhide leather. No quick release: Need tool to remove strap from case. Clasp:Pin Buckle. Stainless Steel clasp.