SEA-GULL

ST1901

Hand-wound chronograph · Column wheel

Country of origin

China

SEA-GULL ST1901, case-back side — CASE-BACK SIDE

FREQUENCY: 21,600vph · 3 Hz
POWER RESERVE: 45+hours*
CHRONOGRAPH: 30minutes
DIAMETER: 31.30mm

Feature check

Automatic winding — no
Manual winding — yes
Hacking seconds — no
Date — no
Day — no
Small seconds — yes
Chronograph — yes
Column wheel — yes
GMT / second time zone — no
Moon phase — no
Perpetual calendar — no
Quartz regulated — no

About the ST1901

Sea-Gull’s hand-wound chronograph, built in Tianjin around a column wheel, the traditional way of coordinating a chronograph’s start, stop and reset. Its design traces back to the Venus 175. With no automatic rotor, the whole chronograph works in plain view: blued screws, gilt wheels and the column wheel itself, well suited to a display caseback. It is wound by hand at the crown.

Column-wheel chronograph
Hand-wound; the full mechanism stays in view
Manufactured in Tianjin by Sea-Gull

Manufacturer Tianjin Sea-Gull Watch Group

Specifications

TYPE: Hand-wound chronograph, column wheel
CALIBRE SIZE: 13¾ lignes · Ø 31.30 mm
HEIGHT: 5.85 mm
JEWELS: 19 to 23, by version*
FREQUENCY: 21,600 vph (3 Hz)
POWER RESERVE: 45 to 50 hours*
FUNCTIONS: Hours, minutes, small seconds at 9
CHRONOGRAPH: Centre seconds, 30-min counter at 3
WINDING: Manual (hand-wound)
DATE: None
COUNTRY OF ORIGIN: China

* Sea-Gull builds the ST1901 in several versions; jewel count and power reserve vary by version and source.