DuRoWe 1980 (INT)

 
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DuRoWe 1980 (INT)

Description

In the late 1970ies, DuRoWe, which belonged to the Ebauches SA in that era, terminated their production of ladies’ watches form movements with their caliber 1980, also known as “INT 1980” or even as “AS 1977-5”. It was the successor of the caliber 1977-4.

The differences to its predecessor were quite a lot. The ratchet mechanism was constructed much simpler (a single, geniously shaped spring instead of a spring-loaded pawl), the balance cock got a little broader shape and the setting lever is now only spring beared, no longer secured by a screw.

Detail: Ratchet

Detail: Ratchet

The DuRoWe 1980 / INT 1980 shown here has got a nominal size of 5 12 lignes, in fact, it’s a little more, 12.9 x 15.2mm.

base plate

base plate

All bearings, except those of the slowly revolving mainspring barrel contain rubies, even the directly driven center minute wheel. On such a tiny movement, it is important to reduce friction as much as possible.

gear train

gear train

Due to the lack of space, the gear train is very stocky, in the area of the escapement wheel even two-storey. The lower bearing of the seconds wheel is not on the base plate, but above the escapement wheel. In the following photo, you can observe this:

side view of the gear train

side view of the gear train

The screw-less anular balance uses as much space as possible on this construction with directly driven center minute wheel. It beats with contemporary 21600 A/h and is beared in two Incabloc protection bearings. It regulates a classical swiss pallet lever movement.

DuRoWe 1980 (INT): Dial side

DuRoWe 1980 (INT): Dial side

Since on the DuRoWe 1980 (INT) the setting lever is no longer secured by a screw, but only springy, this has an impact on the setting lever spring. Its shape differes a lot from that of the DuRoWe 1977-4 (INT), especially by its second arm, which springily bears the setting lever.

Besides that, the dial side shows the contemporary standard of well constructed movements with a yoke winding system and the Incabloc shock protection.

In the lab

The specimen shown here was well used, but in reasonably fair condition and so got only a quick cleaning and oiling.

Timegrapher result

The timegrapher results are very good, especially when you take into account, that it a well used specimen. In four positions, the results are within the chronometer specs, only in two vertical position, the deviation is larger, but still below 30 seconds per day. The amplitude is pretty low and and indication, that this movement is due for a service and probably a new mainspring.

horizontal positions
dial up +2 s/d 235° 0.2ms
dial down 0 s/d 256° 0.1ms
vertical positions
crown right (12 up) +29 s/d 213° 0.1ms
crown up (3 up) -3 s/d 217° 0.2ms
crown left (6 up) 0 s/d 214° 0.0ms
crown down (9 up) +28 s/d 209° 0.5ms

Technical data

Manufacturer:DuRoWe
Caliber:1980 (INT)
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
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:21600
Size:5 1/2 x 6 3/4''' (measured: 12,9 x 15,2mm)
Inventory number:18007

Usage gallery

Osco Damenuhr

Osco Damenuhr