Winding: manual-wind

Frequency - Variations per hour: 3Hz - 21600 V/h

Power Reserve: 50 hours

Accuracy: -10/15 seconds / day

Jewels: 21

Anti-shock: Incabloc

Calibre Sea-Gull ST1901B

Chinese made

Thickness: 6.25

central hr

central min

small sec at 9

Chronograph: 60s counter in center, 30m counter at 3

Watch brands using this movement: Studio Underd0g