Bi-Compax Chronograph

Silver Dial – CHF 3,880


Kennsen watches are individually produced and assembled in Switzerland. Every Kennsen watch is highly modified with the addition our own mechanical mechanisms produced by specialists in the region – genuine traditional Swiss watchmaking.

The Technology

Kennsen's Bi-Compax Chronograph is a pure expression of the classic mechanical chronograph.

The Calibre KV772

The Calibre KV772 designates Kennsen’s Bi-Compax version of the famous Valjoux 7750 chronograph – a benchmark for robustness and precision. The term of Bi-Compax refers to the position of the two sub-dials at 3 and 9 o’clock.

From Bi-Compax to Valjoux 7750 and back again

While the late 1960s are generally associated with the space race, they also saw watchmakers around the world locked in their own competition to create the world’s first self-winding chronograph. By 1969 both races were over with, in the case of the watchmakers, several contenders claiming the title to the first automatic chronograph.

The Swiss movement maker Valjoux, while not directly a competitor, also did not want to be left too far behind in the automatic chronograph stakes and so tasked watchmaker Edmond Capt with re-designing its Bi-Compax 2.5Hz Valjoux 7733 chronograph for automatic winding. Capt achieved this with the aid of a room-sized mainframe computer – an industry first – and the result of his efforts was the 4Hz Valjoux 7750 of 1973.

 

“ It should be the ambition of every professional to make a contribution to his field of study. ”

– George Daniels

The Vallée de Joux (Joux Valley), Switzerland, historic home of the Valjoux movement.
Kennsen’s complications are all manufactured in the valley.

Our re-design of the Valjoux 7750 to create the Kennsen KV772 was in comparison a desk-top affair. Perhaps not as ground-breaking as the original re-design, it does return the movement to its Bi-Compax roots while keeping the automatic winding and legendary reliability.

A Precision Movement

Kennsen’s movements are all adjusted to -2 to +6 seconds per day and in five positions – better performance than that required for chronometer certification.

After casing, each watch is tested for water resistance (5 ATM) and checked again in five positions for functioning and timekeeping.

 
Initial CAD prototyping of Kennsen’s KV772

Initial CAD prototyping of Kennsen’s KV772

Kennsen’s Calibre KV772 is finely finished with Côtes-de-Genève and snailing on the plates. Movement screws have been replaced to complement these finishes.

The matt and anthracite finishing of the rotor adds an interesting counterpoint to the plates.

 

Although hidden beneath the dial, the Bi-Compax plate, manufactured in the Vallée-de-Joux (Switzerland), also sports a rather nice Côtes-de-Genève finishing.

Côtes-de-Genève
on Kennsen’s Bi-Compax
Chronograph Plate


The Design

The Design of the case

The design of the three-part case is another Kennsen in-house development, and emphasises dial clarity and wearer comfort. The case dimensions (42mm diameter; 49mm across the lugs; 13.4mm height) ensures legibility and ease of use, while wrist-friendly lugs provide a comfortable and secure fit. The case has been designed and tested for a water-resistance of 50 metres/165 feet.

Our cases are made in Delémont (Switzerland) by one of the world’s most famous knife makers: Victorinox. Their knowledge of machining steel is second to none.

The case material is 316L1.4435 stainless steel, a superior quality of stainless steel that has a low carbon content and increased nickel and molybdenum levels for improved resistance to damage.

After machining, the different parts of the watch case are hand polished. The case middle is then hand brushed. These polishing operations require patience, a skilled eye and a delicate touch. The watch case is then ready to move onto further production stages.


 

Case Details

The sapphire crystal in the case-back gives a view of the movement and rotor.

Each watch is individually numbered.

The pusher sleeves are a rarely seen touch and are horizontally brushed by hand – a delicate and exacting task.

While the front and back bezels are hand polished, a horizontal brushing (also by hand) has been given to the case-middle. The case chamfers provide a sporty yet elegant feel.

The Design of The Dial

 

The dials are of three levels. Large and well proportioned, each dial is manufactured by dial specialists in Porrentruy (Switzerland). The silver colour, brought through a special galvanic treatment, gives the dials their depth.

Special attention has been paid to the finishing of the various surfaces: Circular graining, matt brushing and sun-ray finishing play with the light, bringing ever changing nuances to the dial.

The markings themselves are pure form-follows-function with the discreet exception of the classic railway minute track on the raised chapter ring.

The Strap

The hand-made top-grade Alligator strap is specially made for Kennsen by Hirsch, Biel/Bienne, Switzerland.

You can purchase Kennsen straps here.

You can of course also decide to replace the strap by any other appropriately sized strap (20mm wide at the lugs, 18mm at the buckle).

 

Kennsen’s hand-made top-grade Alligator strap

 

Kennsen’s hand-made wallet


The Wallet

Kennsen watches are delivered in a hand-made leather wallet which provides a practical and protective storage solution when the watch is not being worn.


Specifications

Functions

  • Timekeeping with hours, minutes, small seconds

  • Chronograph function with minutes and seconds

  • Hacking small seconds

Calibre

  • KV772 Automatic

  • 48 hr power reserve

  • Frequency: 28’800 vph (4 Hz)

  • 29 Jewels

Case

  • Water-resistant to 5 ATM

  • Three-part hand polished and brushed stainless steel

  • Rectangular pushers with hand-brushed sleeves

Crystals

  • Front: Domed, anti-reflective, scratch-resistant sapphire

  • Back: Flat scratch-resistant sapphire crystal

Dial

  • Three level, galvanic plating with matt finishing

  • Raised, sun-ray brushed chapter ring

  • Sunk, circular brushed sub-dials

Hands

  • Galvanic treatment

  • Radius cut

Strap

  • Top grade Alligator

  • 20 mm at the lugs, 18 mm at the buckle

Dimensions

  • Diameter: 42.0 mm

  • Height: 13.4mm

  • Lugs: 49.0 mm