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The Encyclopedia of Horology

Movement record · India

HMT Citizen-derived manual calibre

Partially verified

Manual calibre produced under Japanese technical collaboration

Technical specifications

Diameter
Approx. 25 mm
Height
Not recorded in the sources consulted
Jewels
17
Frequency
18,000 vph (2.5 Hz)
Power reserve
Approx. 40 hours
Winding
Manual, stem wind
Setting
Pendant set
Escapement
Swiss-style lever
Balance
Monometallic balance
Complications
Subsidiary or centre seconds by version

Identification features

  • HMT markings; construction follows the collaborating Japanese design

Known variants

  • Variants across long Indian production

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

Illustrates post-war technology transfer into a national watch industry serving a domestic mass market.

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.