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The Encyclopedia of Horology

Pocket watch · Military navigation pocket watch

Hamilton 4992B 24-Hour Military Pocket Watch

Partially verified

According to the seller, this 16-size, 22-jewel pocket watch was manufactured by Hamilton Watch Company for the United States Government during World War II. It features a Keystone fine silver open-face case measuring 51 mm wide by 15 mm deep with screw-off front and back bezels. The dealer reports a nickel three-quarter plate movement signed 'Hamilton Watch Co, USA, 4992B' with serial number 4C28840, featuring a lever escapement, micrometer regulator, and hacking function. The black metal dial is signed 'G.C.T.' and displays a 24-hour chapter ring indicated by white hands and a central sweep seconds hand. The watch is accompanied by an original-style military cardboard box.

Hamilton 4992B 24-hour pocket watch with accompanying military navigation master box
Hamilton 4992B 24-hour pocket watch with accompanying military navigation master box — Atlam Watches. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.antiquesboutique.com
Category
Pocket watch · Military navigation pocket watch
Maker / attribution
Hamilton Watch Co
Reference
4992B
Catalogue / lot identifier
AB-141589
Source-reported date
circa 1941
Country
United States
Source-reported serial
4C28840

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 Case Construction

The pocket watch is housed in an open-face Keystone fine silver case measuring 51 mm in width by 15 mm in depth. In the photograph, the silver-toned case shows a coin-edged bezel, a fluted crown, and a shaped bow, while the dealer reports turned sides, a smooth plain finish, a mineral glass crystal, and screw-off front and back bezels.

The dial is described by the dealer as black paint on metal, bearing white hands including a central sweep seconds hand. The visual display presents an inner 1 to 24 hour numeral track and outer minute or seconds markings, with the dealer noting the hands make one revolution every 24 hours. The dial is signed 'GCT'.

Evidence for this section
  • “the movement comes in a keystone fine silver open face case, which has a screw off back and front.”
  • “The watch measures 51mm wide x 15mm deep”
  • “The case has turned sides and a smooth plain finish.”
  • “The dial has an inner chapter ring from 1-24 and the hands make on revolution every 24 instead of 2. The dial is signed “GCT””
  • “Black dial displaying an inner 1 to 24 hour numeral track, outer minute/seconds markings, and central 'G.C.T.' signature.”

Reported Movement and Mechanism

The internal movement is not visible in the provided photograph, and all movement specifications derive solely from the dealer description. The seller reports a 16-size, stem-wound and stem-set nickel three-quarter plate movement equipped with a lever escapement and a micrometer regulator.

According to the dealer, an extra wheel and jewel on the top plate raise the jewel count to 22 jewels. The movement is also reported to feature a hacking mechanism that arrests the balance when setting the hands, with the plate engraved 'Hamilton Watch Co, USA, 4992B, 22 Jewels, US Govt, Adj Temp & 6 positions' and numbered 4C28840.

Evidence for this section
  • “This is a 16s 22J pocket watch made for the US Government during WWII.”
  • “Movement – the high quality nickel ¾ plate movement has a lever escapement and a micrometer regulator. The movement has a hacking feature, so that when you set the hands the balance stops allowing you to synchronise your watch with others.”
  • “The movement has a wheel and extra jewel positioned on the top plate, this brings the jewel count from 21J to 22J.”
  • “The movement is signed “Hamilton Watch Co, USA, 4992B, 22 Jewels, US Govt, Adj Temp & 6 positions” # 4C28840”

Packaging and Documentation Discrepancies

The pocket watch is photographed resting on a printed military cardboard container bearing the text 'WATCH; NAVIGATION, MASTER', 'Mfr's. Part No. 4992B', and 'HAMILTON WATCH COMPANY'.

The seller notes that although the watch and box accompanied one another, the handwritten number on the front of the box reads '4037-42', which differs from the reported movement serial number 4C28840.

Evidence for this section
  • “Resting on an accompanying printed cardboard box labeled 'WATCH; NAVIGATION, MASTER', 'Mfr's. Part No. 4992B', and 'HAMILTON WATCH COMPANY'.”
  • “The watch comes in a cardboard box which was made for a 4992B. The watch and box did come together but the handwritten serial number on the front. 4037-42”

Open research questions

  • What specific military specification markings or contract designations, if any, are engraved on the exterior or interior of the Keystone fine silver case back?
  • Does direct examination of movement 4C28840 confirm the stated 22-jewel layout, US Govt engraving, and functional hacking lever?
  • Does the handwritten number '4037-42' on the box represent a military contract or issue number rather than an individual movement serial?

Source evidence

Recorded claims and source quotations for Hamilton 4992B 24-Hour Military Pocket Watch
FieldSource-reported valueSource quotation
Movement Calibre4992B“Hamilton Watch Co, USA, 4992B, 22 Jewels, US Govt, Adj Temp & 6 positions”
Movement Serial Number4C28840“# 4C28840”
Dial SignatureG.C.T.“The dial is signed “GCT””
Case MaterialKeystone fine silver“the movement comes in a keystone fine silver open face case”
Dimensions51mm wide x 15mm deep“The watch measures 51mm wide x 15mm deep”
Winding and Setting MechanismStem wound / stem set“The watch is stem wound / stem set”
Crystal MaterialMineral glass“The watch has a mineral glass”
Movement Size16 size“This is a 16s 22J pocket watch made for the US Government during WWII.”

Visible details

  • Black dial displaying an inner 1 to 24 hour numeral track, outer minute/seconds markings, and central 'G.C.T.' signature.
  • White-finished handset including a central sweep seconds hand and hour and minute hands.
  • Open-face silver-toned case featuring a fluted winding crown, shaped bow, and coin-edged bezel.
  • Resting on an accompanying printed cardboard box labeled 'WATCH; NAVIGATION, MASTER', 'Mfr's. Part No. 4992B', and 'HAMILTON WATCH COMPANY'.

Research qualifications

  • Movement and interior case back are not visible in the photograph; movement specifications and markings rely on dealer description.
  • The dealer notes the handwritten serial number on the box (4037-42) differs from the movement serial number.

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

Terms in this record

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

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