Vintage Longines ULTRA-CHRON 8353-1 watch Chronometer Cal 431 circa 1970

SPECIFICATION

Reference: Longines ULTRA-CHRON 8353
Movement: cal. 431 36000 bph
Age: Circa 1970
Case Size: 36mm
Case Thickness: 11mm
Lug to Lug: 41mm
Lugs: 18mm
Condition: Used Longines watch
Box & Papers: No
Case Material: Stainless Steel
Warranty: 12-Months Warranty

POINTS TO MENTION

• In great preowned condition with light wear from use
• Case and bezel have some light scratches and marks
• Case has some historic pitting
• Fully serviced high Beat 36000 bph automatic movement
• Vertically brushed dial
• Longines signed crown
• Paired with an unworn grey leather strap 

THE WATCH

The Longines Ultra-Chron 8353 is a fascinating example of early 1970s Swiss watchmaking, powered by the celebrated Longines Calibre 431 automatic movement. As part of the Ultra-Chron range, it represents Longines’ ambitious pursuit of greater mechanical accuracy during the era’s high-frequency movement race.

At its heart is the chronometer rated Calibre 431, a sophisticated 25-jewel automatic movement operating at an impressive 36,000 vibrations per hour (5 Hz). This high-beat architecture was cutting-edge for its time, allowing for enhanced precision and earning the Ultra-Chron a reputation as one of the most accurate mechanical watches available before the widespread adoption of quartz technology.

The watch is housed in a stainless steel case measuring approximately 35mm, offering the elegant proportions and slim profile characteristic of late-1960s and early-1970s dress watches. Its sunburst dial is understated yet refined, featuring applied baton hour markers, a neatly framed date aperture, and minimalist stick hands that perfectly complement the design.

Developed as part of Longines’ broader Ultra-Chron programme, the Calibre 431 emerged during a period when Swiss manufacturers were competing to push the boundaries of chronometric performance through higher-frequency escapements. Today, the Ultra-Chron stands as a compelling reminder of that innovative chapter in horological history, combining technical significance with timeless vintage appeal.

A BIT OF TRIVA

The Longines Ultra-Chron was launched in 1966 to celebrate the 100 year anniversary of the company. At that time it was the world's most accurate watch. It was advertised within a “minute a month”. Hi-Beat movements started to be brought to market by the likes of Seiko in their Lord Marvel line Cal. 5740C. The faster oscillating balance was designed to be less vulnerable to shock, making it a better timekeeper. A pleasant side effect was the incredibly smooth seconds hand. Beating at 36,000 beats per hour, Longines developed a new lubricant “molybdenum disulphide” which proved to remain on the parts longer than traditional oil lubricants. The Ultra-Chron line ran for nine years.

During the 1960s and 1970s, the Ultra-Chron collection gained attention, especially in the world of high-performance sports. It was known for its ability to keep precise time under extreme conditions. The Ultra-Chron was marketed as a watch capable of providing "ultra" precision, and it helped to solidify Longines' reputation as a manufacturer of quality, high-performance timepieces.

The Ultra-Chron was only produced until the mid-1970s, and examples are therefore hard to come by. Despite their rarity, this reference was produced in a variety of case and lug shapes, materials, and dial variations.

The Longines Ultra-Chron is remembered as one of the pioneering high-frequency mechanical watches and remains a symbol of Longines' ongoing commitment to precision and craftsmanship. Its introduction helped shape the trajectory of watchmaking in the mid-20th century, especially in the context of high-performance mechanical timepieces.

While the Ultra-Chron may not be as widely recognized as other iconic Longines models, it holds a special place in horological history, marking a significant leap in mechanical watchmaking technology

OUR THOUGHTS

The Ultra-Chron may not be as widely known as some vintage icons, but it remains one of the most interesting watches of its era. Combining Longines’ rich heritage with innovative high-frequency technology, it offers exceptional quality, character, and historical significance. A true collector’s piece from one of Switzerland’s most respected watchmakers.