Raketa 2627.H

Raketa 2627.H | 17jewels.info - The Movement Archive

Raketa 2627.H


With a diameter or 26mm (11 1/2 lignes), the Raketa 2627.H is a rather large, rugged constructed selfwinding movement from the USSR.

Raketa 2627.H: base plate

base plate

It is, as the base plate with its bearing jewels everywhere (except for the mainspring barrel bearing) shows it, of a good quality.

The three, apparently random placed bearing jewels (they are indeed real bearing rubies!) on the positions 11:30, 3:30 and 7 o’lock are noteworthy; they will be discussed later.

Raketa 2627.H: base plate with minute wheel

base plate with minute wheel

Like many conventionally constructed movement, the Raketa 2627.H too uses a directoy driven center minute wheel, It is quite large and has got on its dial side pinion a bearing jewel on the inner side, through which the center seconds pinion will go and will be beared.

Raketa 2627.H: gear train

gear train

The rest of the gear train follows the conventional construction scheme with third wheel, directly driven center seconds wheel and escape wheel.

The center seconds wheel and third wheel have got a large diameter, too.

Raketa 2627.H: side view of the gar train

side view of the gar train

The Raketa 2627.H uses a four-leg anular balance, which is beared in two russian Poljot shock protections bearings.

It beats slowly with 18000 A/h and can be regulated at the hairspring key only.

As escapement, a classical swiss pallet lever escapement is used.

Raketa 2627.H: w/o selfwinding module

w/o selfwinding module

It is nice to see, that the escape wheel is beared in a double bearing with bearing jewel and cap jewel, even secured by an inhouse shock protection. The same double bearing is on the dial side, too.

Compared to its windup relatives, you can see, how much space was saved for the selfwinding mechanism.

Raketa 2627.H: selfwinding module

selfwinding module

The selfwinding mechanism is an own module, which is put onto the movement. Its gear train uses only little space.

Raketa 2627.H: Detail: Selfwinding gear train

Detail: Selfwinding gear train

The gear train for the selfwinding mechanism consists of a double roller changer, where the upper gear engages with the oscillating weight, the lower one acts as a the other rectifier part, then the first reduction wheel is used, and finally, the second reduction wheel with its roller lock engages with the ratchet wheel and decouples the selfwinding mechanism during manual winding.

The ratchet pawl engages with the first reduction wheel and ensures, that the winding always happens in the same direction, regardless of the rotation of the oscillating weight.

Raketa 2627.H: w/o oscillating weight

w/o oscillating weight

The selfwinding module is attached with three screws on the base plate and on the gear train bridge.

Raketa 2627.H: inside the oscillating weight

inside the oscillating weight

The Raketa 2627.H uses a ball beared oscillating weight.

Raketa 2627.H: empty dial side

empty dial side

On the dial side, you see the yoke winding system.

The three bearing jewels on position 0:30, 5:00 and 8:30 o’clock, which were mentioned at the beginning have their purpose to bear the metal calendar ring and to avoid, that metal shaves on metal.

Raketa 2627.H: date switching wheel, lower side

date switching wheel, lower side

The date switching wheel revolves once per day and has got a moveable middle part, against which a spring presses.

Raketa 2627.H: date switching wheel, upper side

date switching wheel, upper side

This spring is responsible, that until midnight enough power is built up, so that the date change happens instantly at midnight. Both indications, date and weekday are advanced at once.

Raketa 2627.H: visible calendar mechanism

visible calendar mechanism

At position 1 o’clock, there’s another oddity: When the crown is pulled over and beyond the hands setting position and afterwards pushed into, the lever mechanism advances the date disc one position. This is a simple, but very efficient date correcting mechanism.

Raketa 2627.H: weekday disc missing

weekday disc missing

The weekday disc with its inner switching star is driven by another switching wheel at position 12 o’clock, which is advanced by a pin on the date switching wheel.

The lever down locks the weekday disc into its correct positions.

Raketa 2627.H: Raketa 2627.H: Dial side

Raketa 2627.H: Dial side

The Raketa 2627.H uses a fourteen positions weekday disc, but not for displaying two languages. The weekday abbreviations are repeated after seven positions.

Raketa 2627.H: movement with retaining ring

movement with retaining ring

Since the oscillating weight overlaps the movement, the Raketa 2627.H is used with a retaining ring, whose inner side gives the oscillating weight the space, it requires.

Timegrapher result

The tested specimen from Hans-Georg perfomed not bad on the timegrapher, even a little bit better than the NOS watch of Jake R.Kaywell, which was gummed and got a little service and whose rates are not shown.

horizontal positions
dial up +8 s/d 285° 0.3ms
dial down +15 s/d 272° 0.1ms
vertical positions
crown right (12 up) +-0 s/d 267° 0.3ms
crown up (3 up) +5 s/d 261° 0.0ms
crown left (6 up) +15 s/d 274° 8.1ms
crown down (9 up) +15 s/d 276° 0.9ms

Technical data

Caliber base:Raketa 2601.H
Size:11 1/2''' (measured: 26,0mm)
lift angle:42°
Number of jewels:29
Escapement:Pallet lever
Balance types: monometallic anular balance (four legs)
Shock protection(s): Poljot
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
  • 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)
  • SCD (direct center seconds)
  • QG (date indication (aperture))
  • JG (weekday indication (aperture))
  • RDR (date corrector)
  • AUT (selfwinding)
Mentioning in literature (years): 1983
Inventory number:21045

Usage gallery

Raketa 2627.H: Raketa gents watch

Raketa gents watch

Raketa 2627.H: Raketa gents watch

Raketa gents watch

This movement and watch was once in NOS condition, golden bracelet and light dial donated by Jake R.Kaywell and once with a dark dial by Hans-Georg. Thank you very much for your great support of the movement archive!