The first lot of National Standard Movement (Chinese pingyin "Tongji") was launched by Shanghai the Second Watch Factory in Janury 1972- 17J movement and named BaoShiHua, factory code ZSE.
Shanghai Watch Factory launched their 1st Nation Standard Movement (Factory code ZSH, 7 series) product in 1974. Production peroid of 7 series - 1972~1985, product catergory as follows:
7110 - man size, 19j handwinding, chorme plated top case
7120 - man size, 19j handwinding
7221 - man size calendar, 19j handwinding
7122 - mid size, 19j handwinding
7222 - mid size calendar, 19j handwinding
7621 - man size date-day, 19j handwinding
SS7 - latest standard model for whole 7's series
------------------------------
Rarest model
7420 - man size automatic mov't - 19J? SS7 with automatic device Date/DD version - Protoype
7020- man size calendar mov't, 19j handwinding mov't- the preview model number of SS7
7220- man size calendar mov't, 19j handwinding Calander mov't with quick-set date function as normal swiss watches
Due to their hugh production figure, I suggest collector only collect those;
1. early model of 7's series,
2. special dial
3. special case (3 piece watch case )
4. Calendar watch with quick-set date function
........................................................................................................
Shanghai 7120's Stainless steel 19J hand-winding early version
Early 7's series dial, above six o'clock on dial
First roll: 19 zuan = 19 jewels
second roll: Zhongguo zhizao = Made in Chian
third roll: Fang Zhen = Shock resistant
.................................................................................
Mid term 7's series, "19zuan & FanZhen" will be found on dial
................................................................................
Latest 7's series, English "19 Jewels, Shock resistant" used on dial
.................................................................................
A normal stainless steel 7120's back-case
-------------------------------------------------------
*1st updated 23 April 2009 - add-on 7110 info, photos of "feng-zhen & 19j resit" added
*2 nd updated 24 April 2009 - amended auto version model frm 7624 to 7420,
