The Historiques Cornes de vache 1955

From Vacheron Constantin -

Courtesy of Vacheron Constantin 

Just the facts, straight from the source -

Courtesy of Vacheron Constantin

Reference 

5000H/000R-B059
Hallmark of Geneva certified timepiece

Caliber 

1142
Developed and manufactured by Vacheron Constantin Mechanical, manual-winding
27.50 mm (12’’’) diameter
5.57 mm thick
Approximately 48 hours of power reserve
3Hz (21,600 vibrations/hour)
164 components
21 jewels

Indications 

Hours, minutes
Small seconds at 9h
Column-wheel chronograph (30-minute counter) 

Case 

18K 4N pink gold
38.50 mm diameter, 10.90 mm thick Transparent sapphire crystal caseback Water-resistance tested at a pressure of 3 bar (approx. 30 meters)

Dial 

Silvered opaline center with sun-brushed external zone (minute-track and tachometer scale)
18K 4N gold applied hour-markers
18K gold hour, minutes and small seconds hands Blued steel chronograph and 30-minute counter
hands

Straps 

Brown Mississippiensis alligator leather with alligator leather inner shell, hand-stitched, saddle-finish, large square scales 

Buckle 

18k 4N pink gold buckle
Polished half Maltese cross-shaped 

Historiques Cornes De Vache 1955

From Vacheron Constantin -

Courtesy of Vacheron Constantin

This is a BEAUTIFUL chronograph!  This is a new release from the folks at Vacheron, the Historiques Cornes De Vache 1955.

The name "Cornes De Vache" is apparently attributable to the shape of the lugs.  These are per a few Google translations - "cow horns".

The case is of platinum and measures (in my feeling) a much more respectable 38.5 mm in diameter.  The case back features a sapphire crystal display, all the better to view and appreciate the manually-wound Calibre 1142.  

The column-wheel chronograph provides a 30 minute counter at 3 o'clock.

Courtesy of Vacheron Constantin

Hours, minutes, seconds (at 9 o'clock) and a column-wheel chronograph (30 minute counter).

Here are the full details, straight from Vacheron -

TECHNICAL DATA

Historiques Cornes de vache 1955

Reference 
5000H/000P-B058

Hallmark of Geneva certified timepiece 

Calibre

1142
Developed and manufactured by Vacheron Constantin
Mechanical, manual-winding27.5 mm (12’’’) diameter, 5.6 mm thick Approximately 48 hours of power reserve 3Hz (21,600 vibrations/hour)
164 components
21 jewels

Indications 

Hours, minutes
Small seconds at 9 o'clock
Column-wheel chronograph (30-minute counter)

Case

Platinum 950
38.5 mm diameter, 10.9 mm thick
Transparent sapphire crystal caseback

Water-resistance tested at a pressure of 3 bar (approx. 30 meters) 

Dial 

Silvered opaline center with sun-brushed external zone (minute- track and tachometer scale)
18K white gold applied hour-markers

Strap 

Dark blue Mississippiensis alligator leather with alligator leather inner shell, hand-stitched, saddle-finish, large square scales

Buckle 

Platinum 950 buckle
Polished half Maltese cross-shaped