The Wostok 2414A, the first revision of the Wostok 2414, belongs as the whole caliber familiy to the most often built and used manual wind movements from Russia.
On the base place you can see, that all bearings, except those for the mainspring barrel, are equipped with synthetic rubies.
It uses a directly driven minute wheel, which is beared below the mainspring barrel bridge.
The crown wheel is located half-way to the center. This position is typical for the whole caliber series.
The gear train with its directly driven center minute wheel and indirectly driven center second represents state of the art of the 1950ies and 1960ies.
A technical clever solution is, that the third wheel drives both, the minute wheel and the center second wheel. The latter is effected by way of the outer rim of the third wheel, which is at the same time in engagement with the fourth wheel drive and with the drive of the indirect central second. Both have only the same number of teeth. The center seconds wheel is held in position by a leaf spring and is prevented from fluttering by its minimal friction.
The way, the height of the balance wheel cock is adjusted, is a bit odd: Below the cock, there's a flat brass stripe, which enlarges the height for the balance wheel cock a fraction of a millimeter.
The screwless balance is beared in two inhouse shock protections and has got three slightly waisted arms. It beats with 19800 A/h and regulates a conventional pallet lever movement.
What exactly are the revision changes to the caliber 2414 is yet unknown.
On the yet empty dial side, you can spot the yoke winding system half way to the center. There's no setting lever screw any more, just a spring. Its pusher on the movement side has great flying abilities :-)
The date indication mechanism works with a switching wheel (at 8 o'clock), which has got a moveable cam. It is responsible for the instant date change ad midnight and the half-fast correction by turning the hands back and forth.
A spring loaded jack at 6 o'clock ensures, that the date remains in position and is not switched back when you turn back the hands. After mounting the cover plate, the spring is inserted.
In the lab
The tested specimen was well working, when it came into the lab and hence was not serviced, but only adjusted a bit.
On the timegrapher
The rates are pretty well, nevertheless on a serviced or brand new specimen, they will be much better:
The perfect adjustment of the beat error in all positions is noteable! The rate differences between vertical and horizontal positions a pretty large, nevertheless on daily wear, they will more or less neutralize each other.
This movement and the three shown watches are a kind donation of the Mr. and Mrs. Ditte. Thank you very much for the support of the movement archive!