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Longines’ High-Frequency Seventies Spirit
Vintage Longines Ultra-Chron reference 8429 belongs to the brand’s early high-frequency wristwatch programme, introduced in 1966. Produced circa 1970, it is powered by the 17-jewel automatic calibre 431, combining centre seconds, a date and a 36,000-vph beat rate. The stainless-steel case frames a refurbished black dial with applied baton indexes and a date aperture at 3 o’clock. This is a focused expression of Longines’ technical ambition at the turn of the decade, with clean, purposeful styling that remains compelling to the contemporary collector.
Watch dossier
Important details, without the clutter.
01Specifications+
- Brand / model
- Longines Ultrachron
- Reference
- 8429
- Estimated production
- circa 1970
- Case material
- stainless steel
- Case diameter
- 37 mm
- Lug-to-lug
- 38 mm
- Thickness
- 11 mm
- Dial
- refurbished
- Crystal
- acrylic
- Crown
- signed
- Strap / bracelet
- Leather Strap
- Movement
- automatic
- Caliber
- 431
- Jewels
- 17
- Movement serial
- 5067****
- Water resistance
- Splash resistant only; not suitable for swimming or immersion
02Service & provenance+
Last serviced: October 5, 2026
The service includes the following operations: • Disassembly of the watch • Movement overhaul: dismantling • Cleaning, reassembly and lubrication • Use of Moebius synthetic oils • Ultrasonic cleaning of the case • Reassembly of the case and the watch • Final technical and aesthetic checks
03Delivery & returns+
Current store policies apply to this purchase.
Included with the watch