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The Encyclopedia of Horology

Wristwatch · Day-date automatic wristwatch

Mido Commander Ocean Star Datoday Chronometer Wristwatch

Partially verified

This gentleman's wristwatch is a Mido Commander Ocean Star Datoday Chronometer, identified by reference number 8439 and dating to the 1970s or 1980s. The watch features a gold-plated case with a stainless steel case back and a diameter of 36 mm. It is powered by an automatic 25-jewel movement that carries official chronometer certification. The gold-toned dial contains applied signature branding, 'Chronometer' script, and the 'OCEAN STAR datoday' designation. Time is indicated by black-edged baton hands with luminous inserts, a gold-coloured centre seconds hand, and applied square indices with black framing and luminous dots. A gold-framed day and date aperture is positioned at 3 o'clock. The assembly includes a fluted gold-coloured crown and a black leather strap with reptile embossing, secured by a gold-coloured folding clasp. The 'Ocean Star' name refers to a proprietary sealing system used by the manufacturer.

Front view of the Mido Commander Ocean Star Datoday Chronometer showing the gold-toned dial, day-date aperture, and leather strap.
Front view of the Mido Commander Ocean Star Datoday Chronometer showing the gold-toned dial, day-date aperture, and leather strap. — Auction house “Kunst- und Auktionshaus Quedlinburg”, via Invaluable. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
orbiscollectibles.com
Category
Wristwatch · Day-date automatic wristwatch
Maker / attribution
Mido
Reference
8439
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1970s/1980s
Source-reported place
Not established
Source-reported serial
9988138

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 Design

The timepiece features a gold-plated case measuring 36 mm in diameter and 11.4 mm in height. It is paired with a stainless steel case back and a fluted, gold-coloured crown. The 'Ocean Star' branding on the dial indicates the presence of a proprietary sealing system developed by Mido.

The dial is finished in a gold tone and incorporates applied Mido signature branding, an applied 'Chronometer' script, and the printed 'OCEAN STAR datoday' designation. Hour markers are applied square indices with black framing and luminous dots. The watch indicates the time with black-edged baton hands featuring luminous inserts and a gold-coloured centre seconds hand, with a gold-framed day and date aperture located at the 3 o'clock position.

Evidence for this section
  • “gold-plated case paired with a stainless steel case back”
  • “gold-toned dial is distinguished by applied Mido signature branding”
  • “The 'Ocean Star' nomenclature signifies Mido’s proprietary sealing system.”

Movement and Technical Specifications

The watch is equipped with an automatic movement containing 25 jewels. This movement holds official chronometer certification, as indicated by the script printed on the dial.

The watch is fitted with a black leather strap featuring reptile embossing, which measures 23 cm in length. The strap is fastened with a gold-coloured folding clasp.

Evidence for this section
  • “powered by an automatic, 25-jewel movement with official chronometer certification.”
  • “black leather strap with reptile embossing and a gold-coloured folding clasp.”

Documentation and Attribution

The watch is identified as a Mido Commander Ocean Star Datoday Chronometer, model reference 8439. The auction documentation attributes the object to the 1970s or 1980s.

The serial number recorded for this specific specimen is 9988138. The documentation provided is based on a single auction-house listing and serves as the primary source for the specifications provided.

Evidence for this section
  • “gentleman's wristwatch is a Mido Commander Ocean Star Datoday Chronometer, model reference 8439, dating to the 1970s or 1980s.”

Open research questions

  • What specific caliber is used in the reference 8439 movement?
  • Does the stainless steel case back feature specific manufacturer hallmarks or date codes indicating its year of production?

Source evidence

Recorded claims and source quotations for Mido Commander Ocean Star Datoday Chronometer Wristwatch
FieldSource-reported valueSource quotation
Reference8439“reference 8439”
Serial number9988138“9988138”
Case materialGold-plated“gold-plated case”
MovementAutomatic“automatic, 25-jewel movement”
Case diameter36 mm“36 mm in diameter”
Dial featuresDay/date aperture“gold-framed day and date aperture at the 3 o'clock position”

Visible details

  • Gold-toned dial with a day and date aperture at the 3 o'clock position
  • Black-edged baton hands fitted with luminous inserts
  • Gold-coloured folding clasp attached to a black embossed strap

Research qualifications

  • The exact date of manufacture remains within a broad 1970s or 1980s window
  • The specific origin or place of manufacture is not documented in the provided source

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

Consulted source

Mido Commander Ocean Star Datoday Chronometer gentleman's wristwatch, reference 8439

Reviewed 2026-11-02 · Record 35b8099086

Terms in this record

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

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