Made in China. Since March 1970, the Ministry of Light Industry has organized a trinity design team composed of workers, cadres and technicians from major watch factories, watch research institutes and relevant colleges and universities in China to carry out the "unification movement". Although the introduction of this movement lost the beauty of personality to a certain extent, it promoted the development of the whole domestic watch industry under the historical conditions at that time. Beijing Watch Factory, as the leading enterprise in the unified machine project, successfully trial-produced the unified movement in Beibiao. Because of the need of export, it is not appropriate to export the sign of Tiananmen Square on the dial to all parts of the world, so the brand and pattern are changed to' Shuangling'.