Chinese standard movement

The Chinese Standard Movement, also commonly known as the Tongji (Chinese: 统机, lit. 'unified mechanism') movement, is a mechanical watch movement that was developed in the People's Republic of China during its fourth Five-Year Plan in the 1970s. It was designed by engineers from several early Chinese watch factories as part of a Ministry of Light Industry initiative to consolidate the industry, and with a few exceptions it became mandatory for all factories to discontinue the production of their own movements and to mass-produce the standard movement.

Source: Wikipedia — Chinese standard movement (CC BY-SA 4.0)