Zhengzhou Watch Factory 郑州手表厂 was established in 1971 in Henan's capital city, Zhengzhou. It is best known for producing Huanghe brand watches, beginning in 1974, but there were a few other brands too. An overwhelming majority of watches the factory manufactured used 16 jewel upgrades of the SN2 movement.

Factory codes: SNZ, SZIZ

Possible factory codes: ZNS, ZZZ