Wostok 2604

 
Wostok 2604

Wostok 2604

Description

An interesting caliber is the 11 1/2 ligne Wostok 2604, formerly known under its name “Saturn”, which was part of the movement family “Pobjeda”.
It offers a decentral seconds indication and a weekday indication at 12 o’clock, but no date indication.

base plate

base plate

All important bearings of this movement contain rubies, the escape wheel even one cap jewel on each side, so that in total, 17 jewels were used.

gear train

gear train

The Wostok 2604 uses the traditional gear train with directly driven center minute wheel, third wheel, seconds wheel at 6 o’clock and steel escape wheel.

side view of the gear train

side view of the gear train

As escapement a swiss type pallet lever escapement is used. The golden toned, non shock-protected screw balance has got eight screws of same difference. It seems, that these screws were not primarily used for posising the balance, but for visual improvements.

Nevertheless, the caliber 2604 uses a kind of Breguet shaped hairspring with bent end curve. It can be regluated with a long regulator arm.

Wostok 2604: Dial side

Wostok 2604: Dial side

On the dial side, you see the mechanism of the odd weekday indication:
There’s a pin on the hour wheel, which twice a day advances the weekday disc with its two-cyrillic shortened weekdays. A spring at 11 o’clock ensures, that the disc snaps in properly.

Besides that, the Wostok 2604 uses a yoke winding system, a further indicator for its fair quality.

In the lab

This movement came lose into the archive and got a simple service.

Timegrapher result

You clearly see the age of this movement, especially in the vertical positions the deviation is really large, while in the horizoncal positions deviation and amplitude are perfect. Probably due to an aged mainspring, too, this movement starts to lose 50° of its amplitude after four hours.

horizontal positions
dial up +4 s/d 294° 1.5ms
dial down +-0 s/d 300° 1.6ms
vertical positions
crown right (12 up) -11 s/d 213° 1.8ms
crown up (3 up) -45 s/d 215° 1.5ms
crown left (6 up) -60 s/d 158° 2.5ms
crown down (9 up) +65 s/d 173° 2.4ms

Technical data

Manufacturer:Wostok
Caliber:2604
Size:11 1/2''' (measured: 26,0mm)
A/h:18000
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance (two legs)
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:4 hole(s)
Features:
  • s (decentral seconds)
  • JG (weekday indication (aperture))
Inventory number:21003

Usage gallery

Saturn gents watch

Saturn gents watch

This movement with watch is a kind donation from Horst Kull to the movement archive. Thank you very much!