Tschudin 250

 
Tschudin 250

Tschudin 250

Description

Long forgotten is the german ebauche manufacturer Tschudin (resp. Schätzle & Tschudin), who initially offered their movements under the brand “Favor”.

The Tschudin 250 is a form movement, whose execution already looks pretty modern, although it was already released in the late 1940ies.

base plate

base plate

All important bearings contain rubies, so that in total, 15 jewels are used - the contemporarily standard of better movements.

It is also visible, that the Tschudin 259 has got a pretty large mainspring barrel, but otherwise leaves lots if space unused. Probably this was one of the reasons, why that movement was not used very often.

gear train

gear train

We have the usual gear train: The mainspring barrel drives the center minute wheel directly, followed by the third wheel. The two following gears, the seconds wheel (at 6 o’clock) and the steel escape wheel are beared under an own cock, this is pretty unusual but simplifies the service.

side view of the gear train

side view of the gear train

The rather simple made screw balance with two legs is of course not yet shock protected. But her frequency of 18000 A/h can be regulated with the help of a long regulator arm.

As escapement system, the usual swiss pallet lever escapement is used.

Tschudin 250: Dial side

Tschudin 250: Dial side

On the dial side, you see the yoke winding system, which is expected on this kind of movement.

At 6 o’clock, there’s the bearing jewel for the decentral seconds hand indication, which was a very popular complication at that time.

Technical data

Manufacturer:Tschudin
Caliber:250
Number of jewels:15
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
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)
Features:s
Functions:hour, minute, decentral second
A/h:18000
Size:6 3/4 x 8 3/4''' (measured: 15,0 x 19,0mm)
Literature: Flume: 1947 130
Inventory number:20014

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