Movement record · China

Seagull ST19

Partially verified

Column-wheel manual chronograph derived from a Swiss design

Technical specifications

Diameter: Approx. 28 mm
Height: Not recorded in the sources consulted
Jewels: 21 (variants differ)
Frequency: 21,600 vph (3 Hz)
Power reserve: Approx. 40 hours
Winding: Manual, stem wind
Setting: Pendant set
Escapement: Swiss-style lever
Balance: Monometallic balance
Complications: Chronograph with minute register

Identification features

Column-wheel switching in a Chinese-made calibre
Architecture derived from a mid-century Swiss chronograph

Known variants

Variants with differing registers and finishing

Servicing notes

Cleaning, lubrication, mainspring and pivot work belong with a qualified watchmaker working from calibre-specific documentation. Conserve original parts: replacing a worn component with a modern substitute changes the object, and refinishing plates or dials destroys evidence.

General guidance only. Antique movements should be serviced by a qualified watchmaker.

Historical significance

A Chinese column-wheel chronograph descended from transferred Swiss tooling, and a widely available route into mechanical chronograph ownership.

Diagram

Schematic: plate and bridge layout. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

Sources & references

de Carle, D., Watch and Clock Encyclopedia
Period trade material catalogues and calibre reference compilations (edition-dependent)
Published manufacturer technical documentation where available

Where sources disagree, the disagreement is stated rather than resolved silently.