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The Encyclopedia of Horology

Wristwatch · Chronograph

Chronoswiss Lunar 'Alfred Rochat & Fils' Chronograph Wristwatch, Ref. 77.890

Partially verified

This Chronoswiss men's chronograph wristwatch from the Lunar 'Alfred Rochat & Fils' series dates to circa 1990 under reference 77.890. It features a polished steel case measuring 37 mm in diameter and 14 mm in thickness, fitted with a domed Plexiglas crystal and screw-down caseback. The silver-tone guilloché dial displays black Arabic numerals, a moon phase aperture at 3 o'clock, small seconds at 9 o'clock, a 30-minute register at 12 o'clock, a 12-hour register at 6 o'clock, and an outer date track indicated by a crescent hand. Powered by an automatic movement based on the ETA 7750, it is paired with a green leather strap.

Front view of Chronoswiss Lunar Ref. 77.890 showing guilloché dial, moon phase, and chronograph registers on green strap
Front view of Chronoswiss Lunar Ref. 77.890 showing guilloché dial, moon phase, and chronograph registers on green strap — Historia Auktionshaus. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.invaluable.com
Category
Wristwatch · Chronograph
Maker / attribution
Chronoswiss
Reference
77.890
Catalogue / lot identifier
908
Source-reported date
circa 1990
Country
Not established

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Object Identity and Construction

This timepiece is listed as a Chronoswiss men's chronograph, identified as part of the 'Alfred Rochat & Fils' series, reference 77.890. The case is described as polished steel with a screw-down caseback and a domed Plexiglas crystal.

The case measures 37 mm in diameter and 14 mm in thickness. The watch is presented with a green leather strap featuring a pin buckle, with a total length stated as approximately 21 cm.

Evidence for this section
  • “manualChronoswiss men’s watch, chronograph, automatic from the Lunar “Alfred Rochat & Fils” series, Ref. 77.890”
  • “polished steel case, screw-down caseback, domed Plexiglas”
  • “diameter 37mm, thickness 14 mm, green leather strap with pin buckle, length approx. 21 cm”

Dial and Complications

The dial is a silver-tone guilloché design featuring black Arabic numerals and blued hands. Complications include a moon phase aperture positioned at 3 o'clock and a circumferential date indicated by a pointer.

The chronograph layout includes a small seconds display at 9 o'clock, a 30-minute register at 12 o'clock, and a 12-hour register at 6 o'clock. A central seconds hand with a stop-function is also noted.

Evidence for this section
  • “silver-tone guilloché dial with black Arabic”
  • “circumferential date, moon phase at 3 o’clock, blued hands”
  • “small seconds at 9 o’clock, minute counter at 12 o’clock, hour counter at 6 o’clock, central seconds with stop-seconds function”

Mechanical Status and Liability

The watch is powered by an automatic movement based on the ETA 7750, which includes a fine adjustment mechanism. The auction house reported the watch was running at the time of their inspection.

Prospective bidders are advised that the auction house provides no warranty regarding the function, completeness, or mobility of mechanical equipment, and descriptions of operational status reflect subjective opinion rather than guarantees.

Evidence for this section
  • “movement based on ETA 7750 with fine adjustment”
  • “running at the time of inspection”
  • “Historia is liable neither for the function, completeness of the components nor for the mobility or functionality of the object.”

Open research questions

  • Is the watch strap an original factory component or a replacement?
  • Does the serial number exist on the caseback, and if so, how does it relate to known production batches?
  • What is the current mechanical state of the movement, given the auction house's disclaimer regarding functional liability?

Source evidence

Recorded claims and source quotations for Chronoswiss Lunar 'Alfred Rochat & Fils' Chronograph Wristwatch, Ref. 77.890
FieldSource-reported valueSource quotation
Reference77.890“Ref. 77.890”
Datecirca 1990“circa 1990”
Case materialPolished steel“polished steel case”
Movement baseETA 7750“movement based on ETA 7750”
Diameter37 mm“diameter 37mm”
Dial descriptionSilver-tone guilloché dial“silver-tone guilloché dial”
ComplicationsCircumferential date and moon phase“circumferential date, moon phase at 3 o’clock”
Estimated Datecirca 1990“circa 1990”
Water Resistance30m“water resistance 30m”

Visible details

  • Silvered textured dial with four sub-dials/apertures and black Breguet-style Arabic numerals.
  • Prominent teardrop or horn-shaped lugs securing a dark green textured leather strap.
  • Crescent-tipped red pointer hand extending to an outer date scale running 1 to 31.

Research qualifications

  • Movement is not visible in the provided photographs.
  • Country of manufacture is not explicitly stated in the catalog text.
  • Operational status and timekeeping accuracy cannot be verified from static images.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

At Auction: Pocket and wrist watches, MANUALCHRONOSWISS MEN’S WATCH, C

Reviewed 2026-10-25 · Record a8d96cdb5c

Terms in this record

Glossary explanations for terms named in this object’s record.

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