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The Encyclopedia of Horology

Movement record · Germany

Hermle 451 chiming movement

Partially verified

Three-train spring-driven chiming movement

Technical specifications

Diameter
Clock movement; plate dimensions vary
Height
Not recorded in the sources consulted
Jewels
Unjewelled to minimally jewelled
Frequency
Pendulum-regulated
Power reserve
8 days
Winding
Key wind
Setting
Hand set
Escapement
Deadbeat or recoil escapement by version
Balance
Pendulum
Complications
Westminster or Whittington chiming, Hour striking

Identification features

  • Hermle stamping with calibre and date codes

Known variants

  • Variants for differing chime and gong arrangements

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 very widely used modern chiming movement, frequently encountered as a replacement in older cases, which matters when judging originality.

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.