ST21

From Chinese Watch Wiki

The ST21 is an automatic, 26 jewel, 28,800 bph watch movement manufactured by Tianjin Seagull . The design is essentially a clone of ETA's 2824 movement. A slightly more generous description is that it is a " re-engineered version of the ETA 2824-2 ", with "unnecessary, wasteful and difficult processes .. removed".

External resources