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The Encyclopedia of Horology

Movement record · China

Sea-Gull ST1901

Partially verified

Column wheel

Technical specifications

Diameter
31.3 mm
Height
5.85 mm
Jewels
19
Frequency
21600 vph
Power reserve
40 h
Winding
Manual
Setting
Stem
Escapement
Lever
Balance
Screw
Complications
Chronograph

Identification features

    Known variants

      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

      Chinese reissue of Venus 175

      Diagram

      top plate or bridgespillar platebalance and cockwheel train between the plates
      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

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

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