Junghans 688.10; Valjoux 7734; bullhead

Caliber Valjoux 7734; Junghans 688.10; Junghans olympic "bullhead"

Chronograph; date; 17 Jewels


Junghans 688.10; Valjoux 7734; Junghans olympic bullhead; Front


Junghans 688.10; Valjoux 7734; Junghans olympic bullhead; movement


Junghans 688.10; Valjoux 7734; Junghans olympic bullhead; back

  • Type: men´s wristwatch Chronograph
  • Manufacturer on dial: Junghans
  • Trademarks/imprint:  6-pointed star with J; JUNGHANS; olympic; at 6: SWISS MADE; Back: STAINLESS STEEL; WATER RESISTANT; INCABLOC
  • Number of jewels: 17
  • Escapement: lever escapement
  • Balance staff: Nickel-Ringbalance
  • Shock protection: Incabloc
  • Particularity: Chronograph
  • Beats per hour: 18.000 A/h
  • Dimensions of movement: 14“‘
  • Time of production: 1971 – 1972
  • Functions: hand winding; Date quick set between 22:00 and 24:00; Chronograph: Chrono center hand 60 sec; at 12: 30 min
  • Display: Hour, minute, running small second at 12; Chronograph s.o. with tachymeter scale 60 to 1000; Date (at 3)
  • Dial: black; circumferential orange shaded tachymeter scale; orange totalizers at 12 and 6; printed white bar indexes with rectangular illuminated dots; white tachymetric scale 1000 - 60 outside
  • Hands: gildet bars with luminous
  • Hands: Sword with with square neck; Chrono center: orange; Totalizer: like second hand
  • Case shape: cushion
  • Case diameter (mm): 46
  • Case material: Steel, Sunray; Polished edges
  • Back: Steel, screwed
  • Bracelet/Strap: not original

A watch from the collection Jens Finkbeiner, with best thanks!

Photos Fischer



Junghans 688.10; Valjoux 7734; Junghans olympic "bullhead"

The side view shows the asymmetry of the case.

The design of this Junghans chronograph with crown and pushers at the upper lug are by Udo Schultheiss.

The same design exists with other brand names.