Wristwatch · Chronograph with triple date and moon phases

Zenith ChronoMaster El Primero Chronomètre

Partially verified

This Zenith ChronoMaster El Primero is a self-winding, stainless steel wristwatch featuring a square-button chronograph mechanism, date registers, and moon phase indication. Produced circa 2000, the watch is equipped with an integrated chronograph caliber, 410Z, which oscillates within a 40 mm diameter polished case featuring a stepped bezel and lugs. The case construction incorporates a transparent back secured by six screws, revealing the rhodium-plated movement finished with oeil-de-perdrix decoration. The dial is satiné silver, characterized by applied steel radial Roman numerals and subsidiary guilloché registers for seconds, 12-hour, and 30-minute timing. An outer tachometer graduation surrounds the dial, complemented by apertures displaying the day of the week, date, month, and moon phase. The timepiece is fitted with steel dauphine hands and a Zenith deployant clasp, and it is accompanied by its fitted box and certificate.

Front view of the Zenith ChronoMaster El Primero showing the dial layout including triple date apertures and moon phase indicator. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: catalog.antiquorum.swiss
Category: Wristwatch · Chronograph with triple date and moon phases
Maker / attribution: Zenith
Reference: Not recorded
Catalogue / lot identifier: 174
Source-reported date: circa 2000
Source-reported place: Switzerland

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

Case and Dial

The timepiece features a polished stainless steel case with a diameter of 40 mm and a thickness of 13 mm. The design includes a stepped bezel and lugs, providing a distinct silhouette. A transparent case back, secured by six screws, permits viewing of the internal mechanism.

The dial is executed in a satiné silver finish and features applied steel radial Roman numerals. Three subsidiary guilloché dials provide functions for seconds, 12-hour, and 30-minute registration. The dial layout also includes an outer tachometer graduation and windows for the day, date, month, and moon phase, with time indicated by steel dauphine hands.

Evidence for this section

“Three-body, polished, stepped bezel and lugs, transparent case back with 6 screws.”
“Satiné silver with applied steel radial Roman numerals, subsidiary ?guilloché? dials for the seconds, the 12-hour and 30-minute registers, outer tachometer graduation, apertures for the day of the week, the date, the months and the moon phases.”

Movement and Escapement

The watch is powered by the Zenith Caliber 410Z. This is a self-winding movement that incorporates a chronograph mechanism. The caliber is finished with rhodium plating and oeil-de-perdrix decoration, comprising 31 jewels.

The escapement is of the straight-line lever type, paired with a monometallic balance and a shock-absorber system. A self-compensating flat balance spring regulates the movement. The auction report notes that the movement requires an overhaul.

Evidence for this section

“M. Cal. 410Z, rhodium-plated, ?oeil-de-perdrix? decoration, 31 jewels, straight-line lever escapement, monometallic balance, shock-absorber, self-compensating flat balance spring.”
“Good Overhaul recommended, at buyer's expense”

Signatures and Components

The Zenith manufacture marks are applied across the primary components of the watch, specifically the dial, the case, and the internal movement. The watch includes a Zenith deployant clasp.

The lot is provided with original secondary components including a fitted box and a certificate, as indicated in the auction documentation.

Evidence for this section

“Dial, case and movement signed.”
“Accompanied by a fitted box and certificate.”
“Zenith deployant clasp.”

Open research questions

What are the specific operational intervals for the service recommendation noted in the auction report?
Does the certificate include the original date of retail sale or original point of purchase?

Source evidence

Recorded claims and source quotations for Zenith ChronoMaster El Primero Chronomètre
Field	Source-reported value	Source quotation
Maker	Zenith	“Zenith, 'ChronoMaster - El Primero', Chronomètre.”
Date	circa 2000	“Made circa 2000.”
Caliber	410Z	“M. Cal. 410Z”
Case Diameter	40 mm	“Diam. 40 mm.”
Case Thickness	13 mm	“Thickness 13 mm.”
Movement Features	31 jewels	“31 jewels, straight-line lever escapement, monometallic balance, shock-absorber, self-compensating flat balance spring.”
Case Material	Stainless steel	“stainless steel wristwatch”

Visible details

Satiné silver dial with applied radial Roman numerals.
Three subsidiary dials featuring guilloché patterns.
Transparent exhibition case back secured by six screws.
Square chronograph pushers located on the right side of the case.

Research qualifications

The auction description explicitly recommends an overhaul of the movement.
The place of manufacture is not explicitly stated in the provided text.

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

Consulted source

'ChronoMaster - El Primero' Zenith, 'ChronoMaster - El Primero', Chronomètre. Made circa 2000. Fine, self-winding, water-resistant, stainless steel wristwatch with square-button chronograph, registers, tachometer, triple date, moon phases and a Zenith deployant clasp. Accompanied by a fitted box and certificate.

Reviewed 2026-10-26 · Record edf26ac104

Terms in this record

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