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The Encyclopedia of Horology

Wristwatch · Trench watch

Longines Caliber 10.68Z Wire Lug Wristwatch

Partially verified

This 1935 Longines wristwatch features a round metal case measuring 27.3 mm across with soldered wire lugs and an 8.4 mm thickness. The patinated beige dial displays printed Arabic numerals, an outer minute track, blued steel hands, and a subsidiary seconds subdial at the 6 o'clock position. Labeled 'FAB. SUISSE' beneath the subdial and signed 'LONGINES' below 12 o'clock, it is powered by a manual-wind Longines caliber 10.68Z movement bearing serial number 5406970, which matches the internal case marking reported by the seller. The watch is fitted to a black leather one-piece strap.

Front view of Longines wire lug wristwatch with patinated Arabic numeral dial
Front view of Longines wire lug wristwatch with patinated Arabic numeral dial — SECOND HAND HOROLOGY. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
secondhandhorology.com
Category
Wristwatch · Trench watch
Maker / attribution
Longines
Reference
Not recorded
Catalogue / lot identifier
WA-0563
Source-reported date
1935
Country
Switzerland
Source-reported serial
5406970

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 Form and Dimensions

The timepiece features a compact circular case with narrow wire lugs and a fluted winding crown situated at the 3 o'clock position. The seller lists physical dimensions of 27.3 mm for the case diameter, 29 mm including the crown, 30.5 mm lug-to-lug, and a thickness of 8.4 mm, with a lug and band width of 10 mm fitted with a black leather one-piece strap.

The specific case metal composition is not identified in the listing. The interior case markings are reported by the seller as 'E.F.Co. LONGINES Fab. Suisse 5406970', sharing the serial number ascribed to the movement.

Evidence for this section
  • “Measurements (mm): Case 27.3”
  • “Case Markings: E.F.Co. LONGINES Fab. Suisse 5406970”
  • “Fluted winding crown at the 3 o'clock position”
  • “Narrow wire lugs holding a black leather one-piece strap”

Dial Configuration and Visual Aging

Visual observation shows a patinated beige dial marked by extensive surface mottling, aging, and darkening. The layout includes bold printed Arabic numerals, an outer minute track, and blued steel hour and minute hands.

A subsidiary seconds subdial sits at the 6 o'clock position, marked with Arabic numerals at ten-second intervals. Dial signatures include 'LONGINES' beneath the 12 o'clock marker and 'FAB. SUISSE' printed along the perimeter below the subdial.

Evidence for this section
  • “Patinated beige dial with extensive surface mottling and aging”
  • “Blued steel hour and minute hands”
  • “Subsidiary seconds dial at 6 o'clock marked with Arabic ten-second numerals”
  • “'FAB. SUISSE' printed along the lower dial edge below 6 o'clock”

Reported Movement and Dating

The seller documents the internal mechanism as a manual-winding Longines caliber 10.68Z (also designated by the seller as Z89 or Longines 10L) with serial number 5406970, dating the watch to 1935.

Because movement and interior case back photographs are not present in the record, the caliber identity, mechanical condition, and reported serial numbering are source-reported and cannot be independently confirmed from the visual evidence.

Evidence for this section
  • “powered by an original Longines movement caliber 10.68Z (Z89)”
  • “Movement: Longines 5406970 Cal. 10.68Z”
  • “vintage military wristwatch trench (wire lug) wristwatch dated from 1935”

Open research questions

  • What specific base metal or precious metal alloy comprises the 27.3 mm case?
  • Can direct physical examination of the movement bridge confirm the caliber 10.68Z stamping and serial number 5406970?
  • Do internal case back stamps corroborate the reported text 'E.F.Co. LONGINES Fab. Suisse 5406970'?

Source evidence

Recorded claims and source quotations for Longines Caliber 10.68Z Wire Lug Wristwatch
FieldSource-reported valueSource quotation
Movement CaliberCal. 10.68Z“powered by an original Longines movement caliber 10.68Z (Z89)”
Movement Serial Number5406970“Movement: Longines 5406970 Cal. 10.68Z”
Case Diameter27.3 mm“Measurements (mm): Case 27.3”
Case MarkingsE.F.Co. LONGINES Fab. Suisse 5406970“Case Markings: E.F.Co. LONGINES Fab. Suisse 5406970”
Lug Width10 mm“Lug Width 10”
Case Lug-to-Lug30.5 mm“Case Lug to Lug 30.5”
Case Width with Crown29 mm“Case with Crown 29”
Case Thickness8.4 mm“Case Thickness 8.4”
Band Width10 mm“Band Width 10”

Visible details

  • Patinated beige dial with extensive surface mottling and aging
  • Blued steel hour and minute hands
  • Narrow wire lugs holding a black leather one-piece strap
  • Subsidiary seconds dial at 6 o'clock marked with Arabic ten-second numerals
  • 'FAB. SUISSE' printed along the lower dial edge below 6 o'clock
  • Fluted winding crown at the 3 o'clock position

Research qualifications

  • Movement and interior case back are not visible in the provided photograph; caliber and serial number are source-reported
  • Specific case metal composition is not specified in the source documentation

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

Consulted source

1935 LONGINES Military Wristwatch Cal. 10.68Z Wire Lug Trench Watch – SECOND HAND HOROLOGY

Reviewed 2026-10-21 · Record fba6ed83cb

Terms in this record

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

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