Longines - Ultronic Chronograph à Diapason - 1975

A rare and visionary chronograph from the mid-1970s, the Longines Ultronic Chrono is powered by the legendary ESA 9210 caliber— the only tuning fork chronograph movement ever produced . This technology represents a bold step in watchmaking history, combining a mechanical chronograph module with the smooth regularity and characteristic hum of an electronic tuning fork. Its rarity and unique operation make it one of the most sought-after Longines models from this era.

This example is in excellent condition, with a clean black dial, crisp white subdials, and original hands. The 36mm steel case retains sharp edges, and the mineral crystal is flawless. The integrated Longines bracelet is complete and fits wrists up to 19.5cm.
The watch has been fully serviced, is in perfect working order, and comes with a 12-month warranty . Finding an Ultronic Chrono in such condition is truly rare.

Brand: Longines
Model: Ultronic Chrono Tuning Fork
Reference: 2368-1
Year: 1975
Diameter: 36 mm
Lug-to-lug: 41 mm
Movement: Quartz (Tuning fork)
Caliber: Longines 749.2 (ESA 9210)
Bracelet: Original Longines steel bracelet
Condition: Excellent — clean case, clean dial, fully functional chronograph
Service history: Fully serviced