Vacheron & Constantin Military Chronograph Corps of Engineers U.S.A.
Record status
Individual type · partial
Period
circa 1918
Maker / issuer
Vacheron ConstantinThis military chronograph pocket watch by Vacheron & Constantin is catalogued to circa 1918 and features a 52 mm four-body silver case bearing number 240379. According to the auction catalogue, the back is engraved 'Corps of Engineers U.S.A., N.
2337'. The signed white enamel dial displays outlined Arabic numerals, skeletonized hands, an outer track divided to 1/5th of a second, and a sunken subsidiary seconds register at 6 o'clock. The movement is reported as keyless winding, numbered 383320, with 20 jewels, a column-wheel chronograph under Paul Nardin patent 54714, a lever escapement, a blued Breguet hairspring, a cut compensated bimetallic balance with screws, and a micrometer regulator.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Type
- Chronograph & split-seconds watch
- Patent
- Paul Nardin patent 54714
- Diameter
- 52 mm
- Case Number
- 240379
- Case Engraving
- Corps of Engineers U.S.A., N. 2337
- Place recorded
- Switzerland
- Movement Number
- 383320
- Reported Condition
- to be serviced
- Maker / attribution
- Vacheron & Constantin
Design
- Movement Details
- The signed, keyless-winding movement, numbered 383320, contains 20 jewels. It utilizes a column-wheel chronograph mechanism based on the Paul Nardin patent 54714. Technical components include a lever escapement, a blued Breguet hairspring, a cut compensated bimetallic balance with screws, and a micrometer regulator.
- Visible features
- • White enamel dial with openwork Arabic numerals and sunken subsidiary seconds dial at 6 o'clock • Silver case exhibiting natural surface patination and tarnishing • Round chronograph pusher positioned on the case band near 11 o'clock adjacent to the bow
- Dial Specifications
- The signed white enamel dial features Arabic numerals and skeletonized hands. Timing functions include a minute track divided into 1/5th of a second increments. A sunken subsidiary seconds dial is located at the 6 o'clock position.
- Case Construction and Markings
- The watch is housed in a 52 mm four-body silver case bearing the number 240379. The case back is engraved with the inscription 'Corps of Engineers U.S.A., N. 2337'. The movement is accessed via a keyless-winding system. A round chronograph pusher is positioned on the case band near 11 o'clock, adjacent to the bow.
Identification
- Serial number
- 240379
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: Case back engraving and internal movement are catalogued but not visible in the provided image
- Research required: Auction catalogue notes the watch is to be serviced