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The Encyclopedia of Horology

Movement record · Switzerland

Vacheron Constantin calibre 1120

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Vacheron Constantin's version of the ultra-thin automatic designed by Jaeger-LeCoultre as the 920, in which the rotor sits within the movement's outer diameter rather than above the plate.

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Technical specifications

Diameter
28.4 mm
Height
2.45 mm
Jewels
36 jewels
Frequency
19,800 vibrations per hour
Power reserve
Approximately 40 hours
Winding
Automatic, by a peripheral rotor running on ball bearings at the movement edge
Setting
Crown setting
Escapement
Swiss lever
Balance
Free-sprung with adjustable mass
Complications
Base calibre; developed into perpetual calendar and skeleton versions

Identification features

  • Peripheral rotor at the movement edge
  • Geneva hallmark on many examples
  • Peripheral-rail rotor
  • Geneva Seal finishing on many examples

Known variants

  • Perpetual calendar versions
  • Skeletonised versions
  • 1120 QP (perpetual calendar)
  • 1120 AT (with chronograph-style complications in later builds)

Servicing notes

Specialist service only; the peripheral rotor bearings are the usual point of wear.

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

Historical significance

Vacheron Constantin's finished version of the Jaeger-LeCoultre 920 ultra-thin automatic, used across slim and sports models from the 1970s.

Photographs

Horloge Vacheron Constantin Paris 1
Horloge Vacheron Constantin Paris 1 — Chabe01, CC BY-SA 4.0. Wikimedia Commons file page
Horloge Vacheron Constantin Paris 2
Horloge Vacheron Constantin Paris 2 — Chabe01, CC BY-SA 4.0. Wikimedia Commons file page
Vacheron Constantin 1120-at - Watchpedia
Vacheron Constantin 1120-at - Watchpedia — watchpedia.net, Rights unverified — web image search result, review pending. Web page (watchpedia.net)

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Manufacturer and specialist descriptions of the 920 / 1120 / 889 family
  2. The same base design is used by more than one house, so attribution should name the design origin.
  3. de Carle, D., Watch and Clock Encyclopedia
  4. Period trade material catalogues and calibre reference compilations (edition-dependent)
  5. Published manufacturer technical documentation where available

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