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The Encyclopedia of Horology

Pocket watch · Split-second chronograph pocket watch

Swiss silver split-second chronograph pocket watch

Partially verified

This Swiss keyless winding open-face pocket watch features a split-second chronograph mechanism housed in a 54 mm .925 silver hinged case. According to the auctioneer, the case carries a London silver import assay mark for 1909 and the sponsor mark WHT for William Horace Thompson, along with case number 10108. The white enamel dial features black Breguet numerals, an outer minute scale, gilt spade hands, and blued steel chronograph hands. Subsidiary registers include a 30-minute register below 12 o'clock and a running seconds dial above 6 o'clock. An oval split-seconds pusher is positioned on the case band near 11 o'clock.

Front view of the silver split-second chronograph pocket watch dial and case
Front view of the silver split-second chronograph pocket watch dial and case — Lyon & Turnbull. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.lyonandturnbull.com
Category
Pocket watch · Split-second chronograph pocket watch
Maker / attribution
Not established
Reference
Not recorded
Catalogue / lot identifier
843
Source-reported date
1909
Country
Switzerland
Source-reported serial
10108

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 Construction and Hallmarking

The watch is housed in a .925 silver hinged case measuring 54 mm in diameter. The case reverse features engine-turning with a decorative central blank cartouche.

The case features a London silver import assay mark for 1909. It is stamped with the sponsor mark 'WHT' for William Horace Thompson, who was registered 1908-1913.

Evidence for this section
  • “silvered (.925) hinged case with engine-turned reverse with decorative central blank cartouche”
  • “Diameter 54mm.”
  • “London silver import assay mark for 1909”
  • “The case stamped WHT for William Horace Thompson who was registered 1908-1913.”

Dial and Visual Appointments

The white enamel dial features black Breguet numerals and an outer minute track. The hand configuration includes gilt spade hands and blued steel chronograph seconds hands.

Subsidiary registers are located for running seconds and a 30-minute chronograph. An oval split-seconds pusher is positioned on the case band.

Evidence for this section
  • “white enamel dial with black Breguet numerals”
  • “outer minute track”
  • “subsidiary dials for running seconds and 30 minute chronograph register”
  • “gilt spade hands, blued steel chronograph seconds hands”
  • “oval split chronograph button to the band”

Movement and Accessories

The watch uses a keyless winding mechanical movement featuring steel chronograph works. The cuvette is plain.

The lot is accompanied by a card case labeled 'The Ascot', identifying the retailer as Weil & Co of Hatton Garden, London, and including an address for J. Levy in Glasgow.

Evidence for this section
  • “Keyless winding mechanical movement with steel chronograph works”
  • “plain cuvette”
  • “labelling the watch ‘The Ascot’ complete with retailer Weil & Co, 111 Hatton Garden, London and stamped address to J.Levy, 92 Abbots Ford Place, Glasgow.”

Open research questions

  • What is the manufacturer or caliber of the mechanical movement?
  • Does the movement bear any internal markings or serial numbers?

Source evidence

Recorded claims and source quotations for Swiss silver split-second chronograph pocket watch
FieldSource-reported valueSource quotation
Case Number10108“Case No.10108”
Assay MarkLondon silver import assay mark for 1909“London silver import assay mark for 1909”
Diameter54mm“Diameter 54mm.”
Case Sponsor MarkWHT (William Horace Thompson)“The case stamped WHT for William Horace Thompson who was registered 1908-1913.”
Case Material.925 silver“silvered (.925) hinged case”

Visible details

  • White enamel dial with subsidiary dials positioned at 12 and 6 o'clock
  • Gilt spade hour and minute hands paired with central blued steel chronograph hands
  • Fluted gold-coloured winding crown set within a silver bow
  • Oval split-seconds pusher located on the case band near 11 o'clock

Research qualifications

  • Internal movement, caseback, and cuvette are not visible in the provided photograph
  • Movement caliber and specific Swiss manufacturer are unstated in the cataloguing

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

Consulted source

Swiss. An unusual silver cased pocket watch with split-second chronograph Case No.10108, London silver import assay mark for 1909 | 3 June 2025

Reviewed 2026-10-22 · Record dc7a6c98fc

Terms in this record

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

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