Longines Ultra Chron Cal 431 Ghost grey Dial

The Longines Ultra-Chron, powered by the Caliber 431, was introduced in 1968 as a high-performance, precision-focused chronometer designed to push the boundaries of timekeeping accuracy. The Caliber 431 was a groundbreaking movement, boasting a high frequency of 36,000 vibrations per hour (vph), which was significantly faster than most other mechanical movements of its time, allowing for improved accuracy. The Ultra-Chron was marketed as the "world's most accurate mechanical watch," and it was tested to meet stringent chronometer standards, ensuring exceptional timekeeping performance. The watch featured a sleek, classic design with a stainless steel case, simple dial markings, and a date function, embodying the elegant yet high-tech ethos of the era. Today, the Longines Ultra-Chron Caliber 431 is considered a milestone in the history of horology, prized by collectors for its technical innovation and vintage appeal.

The one available here today is one with a rather Rare and unique Grey ghost like dial with a white crosshair. 

SR:

SR160106xx

BEZEL MATERIAL
Stainless steel
BRACELET
Leather strap
CALIBER

Cal 431 Serviced

CASE DIMENSIONS

34 mm with 18mm lugs
CASE MATERIAL
stainless steel 
CLASP
buckle
DIAL
ghost grey

GLASS
Plexi crystal,
INDEX
stick
MODEL

Longines Ultra Chron Cal 431 Ref 8317

MOVEMENT

Hi beat CAL 431