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The Encyclopedia of Horology

Wristwatch · Chronograph

Longines Lindbergh Hour Angle Chronograph Ref. L26026

Partially verified

The Longines Lindbergh Hour Angle Chronograph, reference L26026, is a Swiss-made automatic wristwatch housed in an 18-karat yellow gold case. The watch features a 42mm diameter case with an exhibition back, displaying the automatic caliber L674.7 movement, which is based on the Valjoux 7750 architectural design. This movement incorporates 25 jewels and supports chronograph functions with 30-minute and 12-hour registers, alongside a secondary constant seconds sub-dial. A day-date calendar display is positioned at the 3 o'clock mark. The dial is white with silver-toned sub-dials, Roman numeral hour markers, and Breguet-style hands. A bi-directional rotating bezel, also in 18-karat gold, is engraved with degree markings for hour angle calculations, referencing historical aeronautical designs. The watch is fitted with a sapphire crystal and a black alligator leather strap with the maker's original buckle.

Front view of the Longines Lindbergh Hour Angle Chronograph Ref. L26026 featuring a white dial, Roman numerals, and an 18k gold bezel with engraved hour angle markings.
Front view of the Longines Lindbergh Hour Angle Chronograph Ref. L26026 featuring a white dial, Roman numerals, and an 18k gold bezel with engraved hour angle markings. — Zamanito. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Chronograph
Maker / attribution
Longines
Reference
L26026
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1990s
Source-reported place
Switzerland
Source-reported serial
5257674

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 Construction

The watch is constructed with a 42mm diameter case manufactured from 18-karat yellow gold. A distinguishing external feature is the bi-directional rotating bezel, which is also fashioned from 18-karat gold and carries engraved hour angle scales. The case is equipped with an exhibition back that allows for observation of the movement. The winding crown is fashioned in an onion style.

The dial layout features a white surface accented by silver-colored sub-registers. Numerical indications are presented via black Roman numerals, complemented by Breguet-style hands. A day and date aperture is located at the 3 o'clock position on the dial. The assembly is completed with an anti-scratch sapphire crystal.

Evidence for this section
  • “بدنه ۴۲ میلی‌متری آن دارای یک درب پشت شیشه‌ای (Exhibition case back) است”
  • “تاج ساعت به سبک پیازی (Onion style) طراحی شده است”
  • “قاب چرخان دوطرفه این ساعت نیز از طلای ۱۸ عیار ساخته شده”
  • “صفحه ساعت به رنگ سفید با زیرصفحه‌های نقره‌ای طراحی شده”

Movement and Technical Specifications

The timepiece utilizes the Longines caliber L674.7 automatic movement. This movement is constructed upon the architecture of the Valjoux 7750. It contains 25 jewels and serves to power the watch's integrated chronograph complications.

The chronograph functionality includes a 30-minute recorder and a 12-hour recorder, along with a subsidiary seconds hand. Additionally, the movement provides a calendar display showing both the day and date.

Evidence for this section
  • “از کالیبر اتوماتیک L674.7 لونژین بهره می‌برد که بر پایه موتور مشهور Valjoux 7750 ساخته شده است”
  • “شامل قابلیت‌های کرنوگراف با ثبت‌کننده ۳۰ دقیقه‌ای و ۱۲ ساعته، به همراه عقربه ثانیه‌شمار فرعی است”
  • “نمایشگر روز و تاریخ در موقعیت ساعت ۳ تعبیه شده است”

Provenance and Included Accessories

The watch is offered as part of a package that includes the timepiece, an original Longines alligator leather strap, and the maker's original buckle. The provenance documentation indicates that the watch comes with a modern wooden Longines box, an outer box, and a polishing cloth.

The watch is identified by serial number 5257674. According to the provided reports, the object is in excellent physical condition and maintains accurate timekeeping.

Evidence for this section
  • “این ساعت همراه با بند چرمی جدید از پوست تمساح (Alligator) اصلی لونژین و سگک اورجینال عرضه می‌شود”
  • “پکیج کامل شامل جعبه چوبی مدرن لونژین (NOS)، جعبه بیرونی و دستمال مخصوص پولیش نیز به خریدار تقدیم می‌گردد”
  • “این مدل با شماره سریال ۵۲۵۷۶۷۴”
  • “این ساعت در شرایط عالی قرار دارد”

Open research questions

  • Does the serial number 5257674 correlate specifically with the production range of the L26026 model in the 1990s?
  • Does the total weight of 62.2 grams accurately account for all components as stated, or does it refer only to the case gold content?

Source evidence

Recorded claims and source quotations for Longines Lindbergh Hour Angle Chronograph Ref. L26026
FieldSource-reported valueSource quotation
MakerLongines“برند: Longines”
ReferenceL26026“شماره مرجع: L26026”
Serial Number5257674“این مدل با شماره سریال ۵۲۵۷۶۷۴”
Case Material18k yellow gold“بدنه‌ای از طلای ۱۸ عیار زرد ساخته شده است”
MovementAutomatic caliber L674.7 (base Valjoux 7750)“کالیبر اتوماتیک L674.7 لونژین بهره می‌برد که بر پایه موتور مشهور Valjoux 7750 ساخته شده است”
CrystalSapphire“کریستال به کار رفته در این مدل از نوع یاقوت کبود (Sapphire) ضد خش است”
Case Diameter42mm“قطر بدنه: ۴۲ میلی‌متر”
Period1990s“دهه ۱۹۹۰”

Visible details

  • Onion-style winding crown at the 3 o'clock position
  • Engraved degree/hour angle scales on the rotating bezel
  • Engraved rotor visible through the exhibition case back
  • Breguet-style hour and minute hands

Research qualifications

  • The provided weight of 62.2 grams is stated to include the sapphire crystals
  • Independent verification of movement authenticity and precision is not provided

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

Consulted source

ساعت مچی Longines Lindbergh Hour Angle Chronograph مدل L26026 از طلای ۱۸ عیار

Reviewed 2026-11-02 · Record f53a65e5ef

Terms in this record

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

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