Hamilton 4992B 24-Hour Military Pocket Watch

Technical characteristics

Type

Open-face military pocket watch

Dimensions

51mm wide x 15mm deep

Jewel Count

22 Jewels

Place recorded

USA

Movement Serial

4C5583

Case Part Number

PART NO AN 5740

Maker / attribution

Hamilton Watch Co

Case Contract Number

8686

Movement Inscription

Hamilton Watch Co, USA, 4992B, 22 Jewels, US Govt, Adj Temp & 6 positions

Design

Visible features

• Black dial bearing the central painted inscription 'G. C. T.' • Inner chapter ring with Arabic numerals 1 through 24 and an outer minute track calibrated to 60. • White-painted handset comprising a spade-tip hour hand, lance minute hand, and counterbalanced sweep seconds hand. • Reeded coin-edge pattern around the front screw bezel. • Ribbed fluted crown paired with a wide, contoured metal bow.

Visual Dial and Case Configuration

In the provided dial-side photograph, the watch exhibits an open-face format with a black dial bearing painted white markings. The display features an inner 24-hour chapter ring numbered 1 through 24, along with an outer minute track calibrated to 60. The dial is marked with a central painted inscription reading 'G. C. T.' and is paired with a white-painted handset comprising a spade-tip hour hand, a lance-shaped minute hand, and a counterbalanced sweep center seconds hand. The surrounding case bezel displays a reeded coin-edge pattern, and the winding stem is mounted with a ribbed, fluted crown paired with a wide, contoured metal bow. The seller notes that the dial is black paint on metal and fitted with a synthetic glass crystal, describing the dial surface as retaining 'very small marks'.

Reported Movement and Technical Specifications

According to the seller's listing, the watch contains a size 16s, nickel three-quarter plate movement identified as reference 4992B. The seller describes the mechanism as incorporating a lever escapement, a micrometer regulator, and a hacking function that stops the balance wheel when setting the hands to permit synchronization. The seller further states that the movement includes an added wheel and extra jewel on the top plate to bring the total count from 21 to 22 jewels. The movement plate is reported to be inscribed 'Hamilton Watch Co, USA, 4992B, 22 Jewels, US Govt, Adj Temp & 6 positions' and numbered '# 4C5583'. The watch is reported to be stem wound and stem set, with the hands completing one revolution every 24 hours.

Reported Case Markings and Photographic Limitations

The movement is housed in a Keystone base metal open-face case measuring 51 mm in width by 15 mm in depth, equipped with a screw-off front and back. The seller reports that the reverse is engraved with military contract specifications: 'PART NO AN 5740, MFR’S PART NO 4992B, SERIAL NUMBER NO. 25-4, CONTRACT  NUMBER 8686, HAMILTON WATCH CO'. Because only a single frontal dial photograph is provided in the record, the movement details, movement serial number, and case back engravings are not recorded in this photographic view. Additionally, the seller explicitly observes that the case back military engraving is 'extremely faint'.

Identification

Reference

4992B

Serial number

4C5583

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.