Longines watch ULTRA-CHRON Jumbo 7951-1 Vintage Cal 431

SPECIFICATION

Reference : Longines ULTRA-CHRON 7951-1
Movement : 431 25 jewel 36,000 bph
Age : late 60s early 70s
Case Size : 37mm
Case Thickness : 10mm
Lug to Lug : 42mm
Lugs : 18mm
Condition : Used Longines watch
Box & Papers : No
Case Material : Stainless Steel
Warranty : 12-Months Warranty

POINTS TO MENTION

• In fantastic preowned condition with light wear
• Case and bezel have some light marks and scratches
  
• Fully serviced high Beat 36,000 bph movement
  
• Longines signed Crown
  
• Paired with an unworn blue leather strap

A BIT OF TRIVA

The Longines Ultra-Chron, introduced in 1966 to commemorate the company’s 100th anniversary, was one of the world’s most accurate watches at the time, advertised for its precision with a “minute a month” claim. It was a pioneer in high-frequency mechanical watchmaking, with a Caliber 431 movement oscillating at 36,000 vibrations per hour (vph). This made it far more accurate than typical movements of the era, which generally operated at 18,000 or 21,600 vph. The Ultra-Chron’s high-frequency movement, part of Longines’ push toward innovation, was designed to be more resistant to shocks, making it an excellent choice for high-performance sports and professional use. It was also equipped with Longines’ special molybdenum disulphide lubricant, which provided greater longevity than traditional oils.

The Ultra-Chron gained popularity in the 1960s and 1970s for its precise timekeeping under extreme conditions, cementing Longines’ reputation for quality and high-performance timepieces. Housed in durable stainless steel cases, the Ultra-Chron featured various dial and case designs, including the distinctive thick lugs and cushion-style cases. Despite being produced only until the mid-1970s, the Ultra-Chron remains a significant part of Longines' legacy. It is remembered as one of the first high-frequency mechanical watches and a key contributor to the development of modern horology, particularly in the context of professional-grade timekeeping. Today, the Longines Ultra-Chron 8429-5 is a sought-after vintage piece, prized by collectors for its innovation, precision, and timeless appeal.

OUR THOUGHTS

The Longines Ultra-Chron jumbo may not have the headline fame of some vintage icons, but make no mistake — it’s a hidden gem that deserves the spotlight. Powered by a high-frequency movement, the Ultra-Chron is the quiet overachiever of the watch world: precise, reliable, and effortlessly cool. It’s not just a watch; it’s a collector’s dream, a conversation starter, and a standout piece any enthusiast would be proud to wear.