by Youfang (游方)
    
It is possible that the production of balance
wheel electronic watches continued for a reasonably long
period; during that time, the variations in the product’s
internal structure and external style were developed, with
the colours of dial plate ranging from white, blue to black,
and the watch case types including standard and wiredrawing.
Standard watch case
wiredrawing watch case
There were also alterations with the inner
works of the product over the time. In the early model, the
balance wheel was made of red copper, later it was changed
to brass, while the initial white porcelain coil stud plate
being replaced with the one made of blue plastic.
white porcelain coil stud plate
blue plastic stud plate
By looking at the embossed stamps on the back
cover, we can roughly figure out the product sequence, which
should begin with JO-312, then be followed by BC-SD2, BD-SD2
and BE-SD2. Since very few balance wheel electronic watches
survived to this day, and even fewer paper records could
be found, this is the best guess we can come up with so far.
Embossed stamp on the back cover
As for exactly how long the production line
had been running and how many watches were actually released
to Chinese market, no one can tell for sure. We can only
wonder how many more facts regarding China's first generation
electronic watches have been lost to history.
Note from Author: Information
on Wuxi Red Star watches is provided by Mr Zhu Wei, a Wuxi
native, who collected the valuable materials through studying
documents, visiting the sites and talking to the people involved.
I hereby thank Mr Zhu for his wonderful input.
    
Sheriff of USA in China