Chinese Standard Movement (统机 Tongji)

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12”’ | Hand Wind | Swiss Lever | Small Seconds or Sweeping Seconds |

Remarks:

The Chinese Standard Movement, also known as (统机 Tongji = ‘Unified’) or Chinese 2506, was developed in the 1970s as part of the Chinese planned economy. The result was a movement similar to the Enicar AR1010, which was produced in more than 30 factories until the end of the 1970s
The common basis was the manual wind version with 17 jewels and no date. Various factories later added date functions and automatic modules to the movement independently. These parts are therefore not interchangeable between movements from different manufacturers
The movement is still in production today, with skeletonized versions preferred, albeit in increasingly poor quality. The surfaces are often scratched, the accuracy of fit is poor and the jewels are sometimes without oil sinks. The movements can run reasonably well for a while, but overall they are unfortunately among the worst movements produced today
Other variantes of this movements:
- Chinese Standard Movement (统机 Tongji) Automatic
- Chinese Standard Movement (统机 Tongji) Date

Listing ID: 4341
Manufacturer / Brand: Many chinese manufacturers
Caliber: Chinese Standard Movement (统机 Tongji)
Size in French Lignes: 12'''
Size range mm largest diameter: 22 - 31 mm
Shape: Round
Winding: Manual (Crown)
Hands Setting: Crown
Seconds Hand: Sweeping seconds (central seconds)
Escapement: Lever (Swiss, English, Glashütte)
Date, Day, Month...: None
Jewels: 17 - 40
Setting Lever Screw/Pin Position: Right
Balance Position: Bottom (120 - 240°)
Shock Protection: Mostly similar to Incabloc
Beats per hour: 21,600
Balance Type: Unknown
Power Reserve: > 40 hours
Production Period: Since approx. 1972
Identification: Characteristic shape of the setting lever spring and the wheel train bridge.
External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-12#post-2304544
Country: China