Longines GrandeVitesse Chronograph 24h with Second Time Zone

Longines created the GrandeVitesse line to embody the concept of speed through a series of models that pay tribute to the fastest men in history and are intended for the more intrepid among today’s sportsmen. This watch – designed for speed – is characterised by its fluid lines, its aerodynamic curves, its impressive typography, its tachymeter and the finish of its push-pieces.

And now a new model has been added to this range: the GrandeVitesse Chronograph 24h. The impressive case (diameter 44 mm) is fitted with the same L686 movement used in its sister model in the Longines Admiral line. The case features a double tachymeter on the bezel. Graduated in kph as well as MPH, it can be used for measuring ground-speeds of up to Mach 2.

The dial in a choice of black, dark brown or white with a silver sun pattern and featuring a “large 12” brings a sporty touch as well as elegance to the model. This sporty aspect is emphasised by the non-slip surface of the crown, the caseband and the push-pieces. The latest addition to the GrandeVitesse line is available on a steel bracelet with a triple folding safety clasp or a black or dark brown leather strap lined with alcantara and fitted with a folding clasp.

Technical details
Model: GrandeVitesse Chronograph 24h in stainless steel with tachymeter on the bezel

Reference Numbers
L3.637.4.50.x
L3.637.4.60.x
L3.637.4.70.x

Movement
Self-winding mechanical movement
Calibre L686 (ETA Valjoux 7754)
13¼ lines, 25 jewels, 28,800 vibrations per hour
Power reserve of 46 hours

Functions
Hours, minutes, seconds, date and second time-zone
Chronograph
Centre seconds
30-minute counter at 12 o’clock
12-hour counter at 6 o’clock

Case
Round, 44 mm, stainless steel
Black aluminium or brushed stainless steel bezel with double
Mach 2 tachymeter (kph and MPH)
Transparent sapphire glass case back
Water-resistant to 50 metres
Crystal: Sapphire with anti-reflective coating

Dial
Black, chocolate brown or silver sun-pattern dials featuring a “large 12” in Arabic numerals and twelve painted hour-markers
Date aperture at 3 o’clock
Small seconds at 9 o’clock

Hands
Polished, rhodium-plated hands with superluminova coating
Black 24-hour hand with red tip, coated in superluminova

Bracelet/strap
Stainless steel bracelet with triple folding safety clasp or black or brown leather strap with alcantara lining and folding clasp

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