a chinese standard movement self-winding watch stays wound for minimum 40-hour.
a chinese standard movement self-winding watch stays wound for minimum 40-hour.
how long does a chinese standard movement self-winding watch stay wound?
minimum 40-hour
section::::production details and specifications.









































the standard movement was designed to have fewer parts than other similar movements, so that it was easier to produce and service, while at the same time maintaining high accuracy and reliability. the basic specification of the standard wristwatch caliber is a minimum of 17 jewels, 21,600 bph (beats per hour) escapement, a minimum 40-hour power reserve and an average rate within +/-30 seconds per day.
chinese standard movement
the chinese standard movement, also commonly known as the "tongji" (chinese: 统机, "unified") 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. because of this, the production of the standard movement defines an entire era in the history of chinese watchmaking. once the most commonly produced mechanical/automatic watch movements in china, the numbers produced and their quality (at least for a majority of produced movements) have since declined significantly; today the movement lives on typically in simple (even crude) automatic and skeletonized (i.e. using hollowed-out parts and segments such that the inner workings are more visible) variants, usually installed in cheaply produced watches made in china as well.
chinese standard movement