Longines HydroConquest

The Longines HydroConquest series aims to become the preferred watch of divers and enthusiasts of aquatic sports. It has everything required to do so: Water-resistant to 30 bars (300 metres), the round case, made from a solid block, is of stainless steel (also available in two-toned version) and is fitted with a screw-in crown and screw-down case back, superluminova luminescence on the hands and indices to facilitate reading in all conditions, a rubber strap with double security buckle and integrated diving extension-piece.

Nor should we forget the unidirectional turning bezel, an indispensable safety device for divers. To this are added the lateral protection for the crown and the extra index, which makes of the HydroConquest the diving watch par excellence.
Longines has sought to offer a wide range of models which are distinguished from each other not only by type of bezel, but also in terms of size of case and movement: Æ 47.5 (automatic movements) and Æ 41 mm (automatic and quartz movements) for the chronographs, Æ 39 mm for the watches with three hands (automatic and quartz movements). The dial is available in ocean blue, abyss black and silver sunray, all with superluminova hands and indices.

Characteristic of the Longines Sport Collection, the number “12” stands out in terms of size and sober, contemporary design. The unidirectional turning bezel is available in eloxed aluminium or steel with embossed figures. The straps are made from the materials favoured by divers: stainless steel (all steel or two-toned) and rubber, with a double security folding clasp and diving extension-piece. Technical details of different models are given below.

HydroConquest with unidirectional turning aluminium bezel

Reference numbers
L3.640.3.96.7: Quartz
L3.641.4.56.6: Automatic

Caliber
Quartz
– Quartz movement
– Caliber L263 (ETA 955.412)
– 10½ lines, 7 jewels
 Automatic
– Selfwinding mechanical movement
– Caliber L633 (ETA 2824/2)
– 11½ lines, 25 jewels, 28,800 vibrations per hour
– Power reserve of 38 hours

Functions
Hours, minutes, seconds and date

Case
– Quartz: Round, stainless steel, with blue bicolour aluminium bezel and yellow PVD crown, Æ 39 mm. Screw-down case back and screw-in crown with crown protection
– Automatic: Round, stainless steel, with black aluminium bezel, Æ 39 mm. Screw-down case back and screw-in crown with crown protection
Water-resistance: To 30 bars (300 metres)
Crystal: Sapphire with anti-reflective coating

Dials
– Quartz: Blue dial with 12, 6 and 9 Arabic superluminova luminescent numerals and eight superluminova luminescent indices
– Automatic: Black dial with 12, 6 and 9 Arabic superluminova luminescent numerals and eight superluminova luminescent indices. Date opening at 3 o’clock
Hands: Polished rhodium-plated hands with superluminova coating

Bracelets
– Quartz: Bicolour stainless steel bracelet with double safety folding clasp and integrated diving extension
– Automatic: Stainless steel bracelet with double safety folding clasp and integrated diving extension

HydroConquest Chronograph with unidirectional turning aluminium bezel

Reference numbers
L3.643.4.xx.6: Quartz chronograph
L3.644.4.xx.x: Automatic chronograph

Caliber
Quartz chronograph
– Quartz movement
– Caliber L541 (ETA 251.262)
– 13¼ lines, 27 jewels

Automatic chronograph
– Selfwinding mechanical movement
– Caliber L667 (Valjoux 7750)
– 13¼ lines, 25 jewels, 28,800 vibrations per hour
– Power reserve of 46 hours

Functions
Hours, minutes, seconds and date

Quartz chronograph
– Center minute and second hands
– Counter to 1/10th second at 2 o’clock
– 12-hour counter at 10 o’clock

Automatic chronograph
– Center second hand
– 30-minute counter at 12 o’clock
– 12-hour counter at 6 o’clock

Case
Round, stainless steel, with blue or black aluminium bezel, Æ 41 mm. Screw-down case back and screw-in crown with crown protection

Dials
– Quartz Chronograph: Blue or black dial with a “big 12” superluminova luminescent Arabic numeral and eight superluminova luminescent indexes. Date opening at 4 o’clock. Small seconds at 6 o’clock
– Automatic Chronograph: Blue or black dial with a “big 12” superluminova luminescent Arabic numeral and eight superluminova luminescent indexes. Date opening at 3 o’clock. Small seconds at 6 o’clock

HydroConquest with unidirectional turning embossed bezel

Reference numbers
L3.663.4.76.x Æ 39 mm
L3.673.4.76.x Æ 41 mm

Caliber
3 hands Quartz Æ 39 mm
– Quartz movement
– Caliber L263 (ETA 955.412)
– 10½ lines, 7 jewels

Chronograph Æ 41 mm
– Selfwinding mechanical movement
– Caliber L667 (Valjoux 7750)
– 13¼ lines, 25 jewels, 28,800 vibrations per hour
– Power reserve of 46 hours

Functions
Hours, minutes, seconds and date
Chronograph Æ 41 mm
– Center second hand
– 30-minute counter at 12 o’clock
– 12-hour counter at 6 o’clock

Case
Round in stainless steel, Æ 39 mm (3 hands Quartz) Æ 41 mm (Chronograph). With unidirectional turning diving embossed bezel. Screw-down case back and screw-in crown with crown protection
Water-resistance: To 30 bars (300 metres)
Crystal: Sapphire with anti-reflective coating

Dials
– 3 hands Quartz Æ 39 mm: Silver sunray dial with the Arabic superluminova luminescent numerals 6, 9 and12 and ten superluminova luminescent indices. Date opening at 3 o’clock
– Chronograph Æ 41 mm: Silver sunray dial with a ”big 12” superluminova luminescent Arabic numeral and eight superluminova luminescent indices. Date opening at 3 o’clock. Small second at 9 o’clock
Hands: Polished rhodium-plated hands with superluminova coating

Bracelets
– 3 hands Quartz Æ 39 mm: Stainless steel with double safety folding clasp with integrated diving extension
– Chronograph Æ 41 mm : Stainless steel bracelet or black rubber strap with double safety folding clasp with integrated diving extension

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