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The Encyclopedia of Horology

Wristwatch · Mechanical wristwatch

IWC 18K Yellow Gold Calibre 89 Wristwatch

Partially verified

This is a vintage 18K yellow gold wristwatch produced by International Watch Co. (IWC), dated by the seller to 1960. The round gold case measures 33 mm in diameter and houses a seller-reported 17-jewel manual-wind calibre 89 mechanical movement operating at 18,000 vibrations per hour. The champagne-toned dial features applied gold-tone baton indexes, a double baton at 12 o'clock, an outer beaded minute track, and matching hands with a sweep seconds hand. The dial is signed 'International Watch Co. SCHAFFHAUSEN' below 12 o'clock and 'SWISS' at 6 o'clock.

Three-quarter front view of the IWC 18K yellow gold wristwatch on a display mount
Three-quarter front view of the IWC 18K yellow gold wristwatch on a display mount — Secondhand Horology. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
secondhandhorology.com
Category
Wristwatch · Mechanical wristwatch
Maker / attribution
International Watch Co.
Reference
Not recorded
Catalogue / lot identifier
WA-4432
Source-reported date
1960
Country
Switzerland
Source-reported serial
1596046

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 External Construction

The timepiece is housed in an 18K yellow gold circular case measuring 33 mm in diameter. The configuration includes a case width of 35 mm inclusive of the crown, and a lug-to-lug length of 41.7 mm.

The seller reports the case features the hallmark 'International Watch Co. SWISS 18K' and bears the serial number 1596046.

Evidence for this section
  • “Crafted in 18K yellow gold”
  • “Measurements (mm): Case 33”
  • “Case with Crown 35”
  • “Case Lug to Lug 41.7”
  • “Case Markings: International Watch Co. SWISS 18K Serial Number 1596046”

Dial and Hands

The watch features a champagne-toned dial with applied gold-tone baton hour markers and a matching minute/second track. The display includes faceted gold hands.

The dial is signed 'International Watch Co. SCHAFFHAUSEN'.

Evidence for this section
  • “The original champagne dial is in beautiful condition, featuring gold baton hour markers, a gold minute/second track, and matching gold hands.”
  • “The dial is signed "International Watch Co. SCHAFFHAUSEN"”

Mechanism

The watch utilizes an IWC Calibre 89 manual-wind mechanical movement, which the seller states has 17 jewels and a frequency of 18,000 vibrations per hour. The seller lists the movement serial number as 1546797.

As internal components are not visible in the provided photographic evidence, these technical specifications depend on seller documentation.

Evidence for this section
  • “manual-wind powered by an original International Watch Company mechanical movement caliber IWC 89”
  • “featuring 17 jewels with a frequency of 18,000 a/h”
  • “Movement: International Watch Co. Swiss C 89 Serial Number 1546797”

Open research questions

  • Is the provided movement serial number (1546797) consistent with IWC production records for the stated year of 1960?
  • What is the physical condition of the case back interior and movement beyond the provided serial numbers?
  • Can the origin of the discrepancy between the case serial and movement serial be verified through IWC archives?

Source evidence

Recorded claims and source quotations for IWC 18K Yellow Gold Calibre 89 Wristwatch
FieldSource-reported valueSource quotation
Movement CalibreCalibre IWC 89“movement caliber IWC 89”
Jewel Count17 Jewels“17 Jewels”
Case Material18K yellow gold“Crafted in 18K yellow gold”
Case Serial Number1596046“Case Markings: International Watch Co. SWISS 18K Serial Number 1596046”
Movement Serial Number1546797“Movement: International Watch Co. Swiss C 89 Serial Number 1546797”
Case Diameter33 mm“Measurements (mm): Case 33”
Case Thickness8.5 mm“Case Thickness 8.5”
Strap DescriptionHadley-Roma genuine leather“It comes with a brand-new Hadley-Roma genuine leather two-piece strap in brown.”

Visible details

  • Light champagne dial with applied gold-tone baton hour markers and double marker at 12 o'clock
  • Faceted center hour and minute hands accompanied by a central sweep seconds hand
  • Fitted to a reddish-brown textured leather strap with reptile-grain pattern
  • Polished circular bezel with angular tapered lugs and fluted winding crown

Research qualifications

  • Movement and interior case back serial markings are reported by the source and not visible in the exterior photograph
  • Originality and restoration history of the dial and components rely on seller claims

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

Consulted source

1960 International National Watch Co. 17 Jewels Cal. IWC 89 Wristwatch – SECOND HAND HOROLOGY

Reviewed 2026-10-22 · Record 2d06f5b14d

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

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