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Shanghai ZSH SS7

 

Shanghai ZSH SS7Shanghai ZSH SS7

Description

The movement shown here has got no markings at all, but with a little research and a tiny doubt, it can be assigned to the caliber ZSH SS7 of the Shanghai Watch factory in China. It is not 100% sure, since the term "SS7" was used for all kinds of the 17j ZSH movements, regardless whether they use a date indication or not.

This movement is a bit rare, compared to those without date, which were used in countless cheap watches.

The construction is very traditional and easy serviceable - the large four-leg ring balance contains a thick and rugged (hard to break accidentially) hairspring, which is connected to a moveable hairspring stud and whose effective length can be regulated directly on the hairspring key. The balance beats with 21600 A/h and is shock proctected. The shock protection system is made in China and its springs were available in many different shapes, starting from an Incabloc-like type to a "four leaf clover".

main platemain plate

All gears are beared in jewels, even the cannon pinion is jewel-beared on both sides!

dial side without date mechanismdial side without date mechanism

On the dial side, you see, whan was above described as "four leaf clover": The shock protection spring. It reminds a bit of a KIF flector. Otherwise, there are no surprises on the dial, and of course, this movement uses a yoke winding system.

date mechanismdate mechanism

The date mechanism is as simple as genious: The hour wheel drives with six teeth the date wheel with 12 teeth. One of them is longer than the rest and elastic, too. It advances the date ring and is also responsible for the correcting mechanism, which does not turn the date wheel backwards when the time is set back.

Shanghai ZSH SS7 dial sideShanghai ZSH SS7 dial side

As on most of those chinese movements, the top plate was here smeared over with glue to fix the dial. Obviously, dial feet were a luxury item...

 

 

 Technical data

ManufacturerShanghai
CaliberZSH SS7
Number of jewels17
EscapementAnchor with pallets
BalanceNickel
Shock protection(s)China (different types)
Balance cock directioncounterclockwise
Hairspring studmoveable
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel
Center wheel
Mainspring barrel
Winding mechanismyoke
Setting lever spring3 holes
FeaturesSCD,QG,RDR
FunctionsHour, minute, second, day
Beats per hour21600
Size111/4''' (measured: 25,4 mm)
Image in Flume Werksucher -
Shanghai ZSH SS7ShanghaiShanghaiZSH SS711 1/4''''''Shanghai ZSH SS717 Jewels, 11 1/4'''''', 21600 A/h, SCD,QG,RDR
Factsheet

 

 

Links

 

 

This movement was kindly donated by Klaus Brunnemer. Thank you very much!