The caliber 2628.H of the russian Petrodworez watch factory is a handwind movement, which features
a day-date indication.
The suffix .H indicates, that there was one update on the construction.
With its shock protected four leg ring balance and the shock protected escapement
wheel, this movement is suitable for rough situations.
detail: balance cock mounting
Russian movements ofter contain non-standard solutions agains problems with the
fitting precision of some parts. A balance cock, which gives the balance wheel too few space in height
is often found on russian movements, not only at Raketa. The "solution" is a flat metal plate, which
is inserted between the main plate and the balance cock. Simple but efficient.
gears and trains
The movement construction is standard: The minute wheel is located in the center under an
own bridge and thus allowes the usage of a directly driven center second wheel.
For the escapement, a swiss-type pallet lever is used.
slanted view
On the side view, you can see the concentric wheels for minute and second.
main plate
On the Raketa 2628.H, all gears, including the minute wheel are ruby-beared. Only the mainspring
barrel is beared in metal bushings, but technically, that's irrelevant.
At "11:30", "03:30" and "07:30", three additional jewels can be spotted. They are used on the
dial side for bearing the date ring.
dial view without date indication mechanism
The shape of the setting lever spring with its large round plate at the bottom is typical for
Raketa movements.
At "2:00", there's a yoke for the date setting mechanism. It probably advances the date by pulling
the crown, but since on the specimen shown here, the winding stem is missing, it could not be
verified.
dial side view with open date mechanism
The date mechanism is quite extensively made. The setting wheel at "11" is responsible for the instant
switch of date and day.
dial side view with missing weekday disc
The star wheel at 12 o'clock advances the weekday disc one turn.
dial side view
Although the weekday disk has got 14 positions, the weekday is shown only on one language (here:
english).
Technical data
Manufacturer
Raketa
Caliber
2628.H
Number of jewels
19
Escapement
Anchor with pallets
Balance
monometallic ring balance
Shock protection(s)
Poljot
Balance cock direction
clockwise
Hairspring stud
moveable
Regulator type
Hairspring key
Movement construction
Fork Escapement wheel, Fourth wheel, Third wheel Center wheel Mainspring barrel
