Tissot 709-1

 
Tissot 709-1

Tissot 709-1

Description

Around 1960, Tissot launched a tiny handwound movement series for ladies’ watches with a diameter of only 6 34 lignes (15.1mm). It was produced several years and got two subsequent versions. This was the Tissot 709 series and the Tissot 709-1 described here was the first modification of the base movement Tissot 709.

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gears and trains

gears and trains

It is a contemporary construction with a directly driven center minute wheel. The round shape of the plates made it possible to use a relatively large screw-less ring balance.

side view of the gears

side view of the gears

The Tissot 709-1 was a rather high quality movement, you can see for example of the movement-side KIF Duofix bearing of the escapement wheel. Because of it, the escapement wheel is not only protected agains axial impacts, but this bearing is mainly used as a container for oil.

The screw-less ring balance, which is beared in two Incabloc shock protection bearings beats with rather modern 19800 A/h and controls a conventional swiss pallet lever escapement.

base plate

base plate

On the dial side, you can easily spot the second Incabloc bearing of the balance, as well, as the yoke winding system with its setting lever spring.

The minute wheel (at 4:30) has got four holes, which allows oling of the underlying driving wheel without dismounting.

Tissot 709-1 dial side

Tissot 709-1 dial side

Regarding the differents to the Tissot 709 and a larger cutout on the base plate for the yoke.

Technical data

Manufacturer:Tissot
Caliber:709-1
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Functions:hour, minute
A/h:19800
Size:6 3/4''' (measured: 15,3mm)
Literature: Flume: K2 -

Usage gallery

Tissot ladies' watch  (only dial)

Tissot ladies' watch (only dial)