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The Encyclopedia of Horology

Pocket watch · Open-face pocket watch

Patek Philippe Open Face Yellow Gold Pocket Watch

Partially verified

Catalogued by Sotheby's as dating to circa the 1920s, this open face pocket watch by Patek Philippe is cased in 18k yellow gold measuring 46 mm in diameter. The silvered dial features applied gold-toned Breguet-style Arabic numerals, open-tipped hands, a dotted outer minute track, and a subsidiary seconds subdial at 6 o'clock. In addition to the maker signature 'PATEK, PHILIPPE & Cº GENÈVE', the dial is signed 'EBERHARD - MILAN' above the sub-seconds register. The auction house reports a keyless winding movement numbered 807'665 inside case number 609'469, noting signatures on the case, movement, and dial.

Front view of the Patek Philippe open face yellow gold pocket watch showing the silvered dial and retailer signature
Front view of the Patek Philippe open face yellow gold pocket watch showing the silvered dial and retailer signature — Sotheby's. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.sothebys.com
Category
Pocket watch · Open-face pocket watch
Maker / attribution
Patek Philippe
Reference
Not recorded
Catalogue / lot identifier
43
Source-reported date
Circa 1920s
Source-reported place
Switzerland
Source-reported serial
807’665

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

Dial and Retailer Signature

The pocket watch features a silvered dial configured with applied gold-tone Breguet numerals and matching open-tipped Breguet-style hands. Below the 12 o'clock position, the dial is signed 'PATEK, PHILIPPE & Cº GENÈVE', while the retailer signature 'EBERHARD - MILAN' is positioned above the subsidiary seconds dial at 6 o'clock.

The perimeter of the dial features a dotted minute track. The sunken subsidiary seconds dial is finished with concentric circular patterns.

Evidence for this section
  • “Silvered dial with retailer signature 'EBERHARD - MILAN' above the sub-seconds register”
  • “Applied gold-tone Breguet numerals and open-tipped Breguet-style hands”
  • “Sunken subsidiary seconds dial at 6 o'clock with concentric circular finishing”

Case Construction

Catalogued in 18k yellow gold, the open-face case measures 46 mm in diameter. Visible housing elements include a fluted winding crown beneath an angular bow at the 12 o'clock position.

The auction catalogue specifies case number 609'469 and notes that the case, movement, and dial are signed.

Evidence for this section
  • “Size: 46 mm diameter”
  • “Case: 18k yellow gold”
  • “Case number: 609’469”
  • “Angular bow atop a fluted winding crown”

Mechanism and Documentation

The cataloguing identifies the movement as a keyless winding calibre bearing movement number 807'665. The auction details note that the movement is signed, though it is not visible in the provided public photograph.

The lot is catalogued with a date of circa the 1920s. According to the auction listing, there are no box, papers, or accessories included.

Evidence for this section
  • “Calibre: keyless winding”
  • “Movement number: 807’665”
  • “Signed: case, movement and dial”
  • “Box: no Papers: no Accessories: none”

Open research questions

  • What specific calibre dimensions, jewel count, and escapement layout are present on movement number 807'665?
  • Does the case back feature any personal monogram, engine turning, or a plain polished finish?
  • Do Patek Philippe manufacture archive records confirm delivery of movement 807'665 and case 609'469 to retailer Eberhard in Milan, and what is the exact recorded date of sale?

Source evidence

Recorded claims and source quotations for Patek Philippe Open Face Yellow Gold Pocket Watch
FieldSource-reported valueSource quotation
Movement Number807’665“Movement number: 807’665”
Case Number609’469“Case number: 609’469”
Case Material18k yellow gold“Case: 18k yellow gold”
Diameter46 mm“Size: 46 mm diameter”
Calibre TypeKeyless winding“Calibre: keyless winding”
DialSilvered“Dial: silvered”
SignaturesCase, movement and dial“Signed: case, movement and dial”
Accompanying ItemsNone (no box, no papers, no accessories)“Box: no Papers: no Accessories: none”
Provenance DescriptionProperty of a Gentleman“Property of a Gentleman”

Visible details

  • Silvered dial with retailer signature 'EBERHARD - MILAN' above the sub-seconds register
  • Applied gold-tone Breguet numerals and open-tipped Breguet-style hands
  • Sunken subsidiary seconds dial at 6 o'clock with concentric circular finishing
  • Angular bow atop a fluted winding crown

Research qualifications

  • Movement and case back interior are not shown in the provided photograph
  • The case back decoration or plain finish is not visible

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

Consulted source

Patek Philippe | An open face yellow gold pocket watch | Circa 1920s

Reviewed 2026-10-21 · Record bdf6efa55a

Terms in this record

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

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