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.Video on YouTube
With its shock protected four leg ring balance and the shock protected escapement wheel, this movement is suitable for rough situations.
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.
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.
On the side view, you can see the concentric wheels for minute and second.
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.
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.
The date mechanism is quite extensively made. The setting wheel at “11” is responsible for the instant switch of date and day.
The star wheel at 12 o’clock advances the weekday disc one turn.
Although the weekday disk has got 14 positions, the weekday is shown only on one language (here: english).
|Number of jewels:||19|
monometallic anular balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||4 hole(s)|
|Functions:||hour, minute, second, day, week day|
|Size:||11 1/2''' (measured: 25,6mm)|