Longines Ultra-Chron 7829-2 - The Square Icon of High Frequency!
A Milestone in Timekeeping:
A product of the last great race in Swiss watchmaking, dating back to the late 1960s, when the limits of mechanical precision were pushed.
This Ultra-Chron is an iconic testament to Longines' high-frequency breakthrough.
Presented in "New Old Stock" (NOS) condition, with its original box and preserving its factory sharpness from 1968, this Ref. 7829-2 is a rare example with a modernist square case, housing the brand's legendary 36,000 A/h Caliber 431 movement.
IMPORTANT NOTE: Since this product will be shipped within the European Union, you will not pay customs duties if you are within the EU.
Product Identification and Technical Data
Category Details
Brand / Model Longines Ultra-Chron Automatic
Reference 7829-2
Date of Manufacture: October 1968 (confirmed by case code 10-68)
Caliber: Longines Caliber 431 (signature of the Ultra-Chron series)
Frequency: 36,000 A/h (10 beats per second – twice that of standard mechanicals)
Number of Jewels: 25 Jewels
Thickness: 10 mm
Precision Claim: The highest level of stability and accuracy achieved by mechanical watchmaking in the pre-quartz era
Design and Aesthetic Highlights
Case Architecture: An angular, sharply defined square form reflecting the modernist aesthetic of the late 1960s.
Surface Finish: The brushed and polished surfaces of the case still retain their factory sharpness (clearest evidence of NOS status).
Dial: Satin-brushed silver-white tone; Technical elegance with minimalist baton indices.
Seconds Movement: Thanks to the high frequency of the Cal. 431, the seconds hand moves with almost flawless fluidity.
Condition and Collectible Value
Condition: NOS (New Old Stock). Preserved with its original box and all its details from 1968.
Collection Context: The Ultra-Chron series is Longines's ambitious response to the "High Frequency Race" of the 1960s. This model represents the last great mechanical engineering triumph of the era just before the advent of quartz watches.
Rarity: The square-cased reference 7829-2 was produced in much more limited numbers than the circular Ultra-Chrons. Finding it in this NOS condition with its original box is a rare opportunity in the global collectors' market.
Final Word
The Longines Ultra-Chron Ref. 7829-2—a time capsule of both precision engineering and the modernist spirit of the 1960s. More than a watch; it's a work that doesn't measure time, but rather one that recreates the rhythms of the past.
The item you're viewing was manufactured in 1968.
Professionally overhauled and FULLY SERVICED (the movement is completely disassembled, its components cleaned, oiled, and adjusted), your watch will function flawlessly without any surprises. (It's maintenance-free for 3 years unless exposed to direct water or high humidity for extended periods.)
Item Condition: Tested, fully functional, and in working order.
