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The Encyclopedia of Horology

Wristwatch · Tank wristwatch

Hamilton Tank Masterpiece Wristwatch

Partially verified

This Hamilton Masterpiece wristwatch is encased in 14K yellow gold and features a rectangular tank-style profile. The watch houses a manual-winding caliber 770 movement with 22 jewels, operating at a frequency of 18,000 vibrations per hour with an approximate power reserve of 45 hours. The light gray dial is fitted with Arabic numerals at the even-numbered hours, gold baton markers, and a subsidiary seconds dial at the 6 o'clock position. The gold Dauphine-style hands complement the geometric aesthetic. The case back is engraved with "Hamilton Watch Co. – Lancaster PA – 14K gold – C98934." The watch is currently fitted with a brown lizard-patterned strap and is reported by the seller to have been recently serviced. The model was produced in Lancaster, Pennsylvania, during the mid-twentieth century.

Front view of the Hamilton Tank Masterpiece 14K gold wristwatch.
Front view of the Hamilton Tank Masterpiece 14K gold wristwatch. — laurent-fine-watches.myshopify.com. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
laurent-fine-watches.myshopify.com
Category
Wristwatch · Tank wristwatch
Maker / attribution
Hamilton
Reference
Not recorded
Catalogue / lot identifier
Hamilton-Masterpiece-V-10-14-2026
Source-reported date
1955 to early 1960's
Source-reported place
United States
Source-reported serial
C98934

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 and Dial Design

The watch features a rectangular 14K yellow gold case measuring 28mm in width and 39mm in total length including the lugs. The case houses a light gray dial that incorporates a combination of Arabic numerals at the 2, 4, 8, and 10 positions, interspersed with gold baton hour markers. A dedicated subsidiary seconds dial is located at the 6 o'clock position, and the term "Masterpiece" is printed below the 12 o'clock marker.

The handset consists of gold-colored Dauphine-style hour and minute hands. The winding crown located on the side of the case displays the manufacturer's logo. The back of the case is engraved with technical information including the manufacturer's name, the location of production in Lancaster, Pennsylvania, the material composition, and the serial number C98934.

Evidence for this section
  • “14K yellow gold back case with engraved inside “Hamilton Watch Co. – Lancaster PA – 14K gold – C98934””
  • “Hamilton Tank Masterpiece with light gray dial and Arabic numerals and gold batons for each hour with Masterpiece engraved at 12 o’clock.”
  • “The hands are in gold with Dauphine style.”

Movement and Technical Specifications

The timepiece is powered by a manual-winding movement identified as the Hamilton caliber 770. This movement features 22 jewels and runs at a balance frequency of 18,000 vibrations per hour (A/h). According to historical information provided in the source documentation, this specific caliber was manufactured at the company's facility in Lancaster, Pennsylvania, between 1955 and the early 1960s.

The movement is capable of an approximate power reserve of 45 hours when fully wound. The auction description reports that the movement has been serviced, ensuring its functional status. No further documentation regarding the specific nature of the service is provided.

Evidence for this section
  • “Hamilton manual winding movement with caliber 770 with 22 jewels, 18,000 A/h and approximately 45 hours of power reserve.”
  • “It was produced in Lancaster, PA from 1955 to early 1960’s.”
  • “The movement is serviced.”

Provenance and Identification

The object is identified as a Hamilton Masterpiece model. The watch is currently catalogued by the vendor as a vintage timepiece.

The physical characteristics of the watch, including the internal case engravings, corroborate the link to the Lancaster-based production era of the Hamilton Watch Company. The item is offered without original box or paper documentation.

Evidence for this section
  • “The company was founded in 1892”
  • “In 1969, it stopped to produce mechanical watch in the US.”
  • “BOX: NO”
  • “PAPER: NO”

Open research questions

  • Does the serial number C98934 correspond to a specific year of manufacture within the 1955–1960 range?
  • Is the dial original to the piece or a documented refinish, given the visible surface spots?

Source evidence

Recorded claims and source quotations for Hamilton Tank Masterpiece Wristwatch
FieldSource-reported valueSource quotation
MakerHamilton“Hamilton”
ModelMasterpiece“Masterpiece”
MovementCaliber 770“manual winding movement with caliber 770”
Jewel Count22“22 jewels”
Case Material14K Yellow Gold“14K yellow gold back case”
Serial NumberC98934“C98934”
Production LocationLancaster, PA“produced in Lancaster, PA”
Power Reserve45 hours“approximately 45 hours of power reserve”
Frequency18,000 A/h“18,000 A/h”

Visible details

  • Light gray dial with scattered discoloration
  • Gold-tone crown embossed with the Hamilton logo
  • Engraved inner case back details
  • Brown lizard-patterned leather strap

Research qualifications

  • Exact year of manufacture within the 1955-1960s range is not specified
  • Extent of prior servicing not documented beyond seller report

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

Consulted source

ساعت مچی Hamilton Tank Masterpiece

Reviewed 2026-11-02 · Record 607667fde9

Terms in this record

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

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