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The Encyclopedia of Horology

Wristwatch · Pocket watch conversion wristwatch

Zenith Grand Prix Paris 1900 Pocket Watch to Wristwatch Conversion

Partially verified

This antique timepiece is a Zenith manual-wind open-faced pocket watch movement converted into a wristwatch, dated by the seller to 1906 using movement serial number 7046624. The 48.9 mm double-hinged case features inner case markings including 'Metal Blanc Garanti', case number 5281644, and commemorative 'Grand Prix Paris 1900' text. Configured with attached wristwatch lugs, an onion winding crown at 3 o'clock, and an orange-brown embossed leather strap, the gilt movement bridges display the Zenith signature, serial number, balance wheel assembly, and winding mechanism.

Rear three-quarter view showing the opened hinged case back, Zenith open-face movement, and attached leather strap.
Rear three-quarter view showing the opened hinged case back, Zenith open-face movement, and attached leather strap. — SECOND HAND HOROLOGY. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
secondhandhorology.com
Category
Wristwatch · Pocket watch conversion wristwatch
Maker / attribution
Zenith
Reference
Not recorded
Catalogue / lot identifier
WA-3251
Source-reported date
1906
Country
Switzerland
Source-reported serial
7046624

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 Conversion

This object is an antique Zenith open-faced pocket watch movement that has been adapted into a wristwatch format. In its converted configuration, it features an onion-style winding crown positioned at 3 o'clock and attached soldered wristwatch lugs fitted with an orange-brown alligator-grain patterned leather strap.

The seller dates the movement to 1906 based on serial number 7046624. Because this piece is an aftermarket conversion rather than an original factory wristwatch, the timing, source, and workshop origin of the wristwatch conversion remain unverified.

Evidence for this section
  • “Movement plate stamped with serial number 7046624.”
  • “This is an uncommon pocket watch converted to a wristwatch, and most interestingly, the crown is centered at 3 o'clock”
  • “However, the serial number 7046624 did allow us to accurately date this unique watch to 1906 .”

Case Construction and Markings

The double-hinged case measures 48.9 mm in diameter (listed as 58.5 mm including the crown, 57.6 mm lug-to-lug, and 14 mm thick) with a 22 mm lug width. The seller reports that the crystal is a replaced domed plastic crystal.

According to the seller's listing, the interior of the case back bears multiple stamped marks: the Zenith name and star logo, the base-metal designation "Metal Blanc Garanti" (which the seller suggests translates to Guarantee White Metal, likely French silver plate), the case number 5281644 stamped twice, the letter "P", and the commemorative inscription "GRAND PRIX PARIS 1900".

Evidence for this section
  • “Case Diameter: 48.9”
  • “covered by a replaced dome plastic crystal.”
  • “The inside of the case back is signed with the Zenith name and star logo, Metal Blanc Garanti, 5281644 (twice), P, and GRAND PRIX PARIS 1900 .”

Reported Dial Motif and Movement Details

The supplied rear photograph displays only the open hinged case back, showing a gilt manual-wind movement signed "ZENITH" with serial number 7046624 alongside the balance assembly and winding mechanism. The dial side is not visible in the provided image.

As reported by the seller, the dial is finished in deep hunter green enamel featuring a multi-colored roulette wheel motif in red, yellow, black, green, white, and gold, inscribed "Zenith Le Casino De Mone Carlo". The seller also reports a subsidiary seconds display positioned at 9 o'clock, white Breguet-style primary hour numerals, faint orange Breguet numerals for hours 13 through 24, and gold leaf-style hands.

Evidence for this section
  • “Hinged outer case back open revealing the gilt manual-wind movement signed ZENITH.”
  • “The enameled dial is a lovely deep hunter green featuring a colorful roulette motif, marked "Zenith Le Casino De Mone Carlo" with original gold leaf-style hands.”
  • “Also, the sub second is at 9 o'clock- rare indeed for any watch style!”

Open research questions

  • Is the 'Le Casino De Mone Carlo' roulette dial an original custom Zenith enamel dial or a later decorative addition created at the time of the wristwatch conversion?
  • Were the soldered wrist lugs added to an original Zenith pocket watch case, or is the case an aftermarket conversion housing adapted to fit the 1906 movement?
  • Does the 3 o'clock crown combined with a 9 o'clock sub-seconds layout indicate an open-face caliber rotated in its housing, a hunter-style movement layout, or a modified geartrain?

Source evidence

Recorded claims and source quotations for Zenith Grand Prix Paris 1900 Pocket Watch to Wristwatch Conversion
FieldSource-reported valueSource quotation
Movement Serial7046624“Movement: Zenith 7046624”
Case Number5281644“5281644”
Case Material MarkingMetal Blanc Garanti“Metal Blanc Garanti”
Case Diameter48.9 mm“Case Diameter: 48.9”
Lug Width22 mm“Lug Width: 22”
Case Lug to Lug57.6 mm“Case Lug to Lug: 57.6”
Strap MarkingBros Cvcrro A Mano“marked Bros Cvcrro A Mano with a shiny silver buckle”

Visible details

  • Hinged outer case back open revealing the gilt manual-wind movement signed ZENITH.
  • Movement plate stamped with serial number 7046624.
  • Prominent onion-style winding crown positioned at 3 o'clock relative to the movement orientation.
  • Attached soldered strap lugs holding an orange-brown alligator-grain patterned leather strap stamped 22 on the lining.

Research qualifications

  • The dial is not visible in this photograph, so dial motif and inscriptions cannot be independently verified from this view.
  • This represents an aftermarket or historical conversion from an antique pocket watch rather than an original factory wristwatch.

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

Consulted source

1906 Zenith Le Casino Monte Carlo Pocket Watch-Wristwatch Grand Prix P – SECOND HAND HOROLOGY

Reviewed 2026-10-21 · Record 6893d9b410

Terms in this record

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

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