Shanghai ZSH SS7
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| Shanghai ZSH SS7 |
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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".
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| empty main plate |
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All gears are beared in jewels, even the cannon pinion is jewel-beared on both sides!
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| empty main plate |
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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.
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| date mechanism |
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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.
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| dial side view |
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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
| Manufacturer | Shanghai |
| Caliber | ZSH SS7 |
| Number of jewels | 17 |
| Escapement | Anchor with pallets |
| Balance | Nickel |
| Shock protection(s) | China (different types) |
| Balance cock direction | counterclockwise |
| Hairspring stud | moveable |
| Regulator type | Hairspring key |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel
Center wheel
Mainspring barrel |
| Winding mechanism | yoke |
| Setting lever spring | 3 holes |
| Features | SCD,QG,RDR |
| Functions | Hour, minute, second, day |
| Beats per hour | 21600 |
| Size | 111/4''' (measured: 25,4 mm) |
| Image in Flume Werksucher | - |
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| Factsheet |
