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High-Frequency Precision, Quietly Expressed
Vintage Longines Ultra-Chron ref. 7827 reflects the brand’s late-1960s pursuit of practical high-frequency precision. Introduced in 1966, it combines a 35 mm steel case with the automatic calibre 431, running at 5 Hz and equipped with a date display. Its original silver dial, applied baton markers, defined lug facets and linear brushing give the watch a disciplined, modernist presence without excess. The calibre’s 36,000-vibration-per-hour architecture places this restrained design within an important period of Longines technical development, making it an engaging choice for collectors drawn to thoughtful engineering and wearable proportions.
Watch dossier
Important details, without the clutter.
01Specifications+
- Brand / model
- Longines Ultra - Chron
- Reference
- 7827
- Estimated production
- 1966–1971
- Case material
- stainless steel
- Case diameter
- 35 mm
- Lug-to-lug
- 40 mm
- Thickness
- 10 mm
- Dial
- original
- Crystal
- acrylic
- Crown
- original
- Strap / bracelet
- Leather Strap
- Movement
- automatic
- Caliber
- 431
- Jewels
- 17
- Movement serial
- 5045****
- Water resistance
- Splash resistant only; not suitable for swimming or immersion
02Service & provenance+
Last serviced: October 6, 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