China 2650G
Description
A derivative of the China Standard Movement is the gilt skeletonized version, called as China 2650G.
It has the unchanged diameter of 11 1/2 lignes.
base plate
Besides a color error, the base plate looks pretty ok, but is very crudely executed. But on the other hand, all bearings contain rubies. Not high quality rubies, but simple, completely flat ones without oil storages.
center minute wheel
The center minute wheel is ruby-beared on both pivots.
gear train
The China 2650G has got the standard gear train consisting of mainspring barrel, directly driven center minute wheel, third wheel, directly driven center seconds wheel and finally the steel escape wheel for the pallet lever escapement.
side view of the gear train
The rather large four-leg anular balance in beared in a pair of inhouse shock protections. It beats with 21600 A/h and can be adjusted (more or less) on the hairspring key directly.
lower side mainspring barrel
In this skeleton version, the floor of the mainspring barrel is open, so that you can see from the dial side, how far the movement is wound up.
very simple ratchet
The ratchet is as simple as genious, it consists of only one part, a round spring, which blocks the ratchet wheel.
China 2650G: Dial side
Unfortunately, the specimen of the chinese caliber 2650G has got a coloring error on the dial side too, because of which a part of the gilt coloring is missing. Nevertheless, this movements allows nice views, how a movement works.
Of course, a yoke winding system is used, and, since a skeleton watch has got no dial, the hour wheel is held in position with an own spring cover.
In the lab
Timegrapher result
For the simple execution of this movement, which lacks any fine treatment, the rates are surprisingly well!| horizontal positions | |||
|---|---|---|---|
| dial up | +10 s/d | 277° | 0.4ms |
| dial down | +2 s/d | 285° | 0.2ms |
| vertical positions | |||
| crown right (12 up) | -10 s/d | 244° | 0.6ms |
| crown up (3 up) | -2 s/d | 240° | 0.4ms |
| crown left (6 up) | -14 s/d | 241° | 0.5ms |
| crown down (9 up) | -9 s/d | 240° | 0.6ms |
Technical data
| Manufacturer: | China |
| Caliber: | 2650G |
| Size: | 11 1/2''' (measured: 25,4mm) |
| A/h: | 21600 |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: |
monometallic anular balance (four legs) |
| Shock protection(s): |
China (different types) |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 2 hole(s) |
| Attachment of setting lever: | plugged |
| Features: |
|
| Inventory number: | 23026 |
Usage gallery
anonymous skeleton watch