Shanghai ZSE Z-A

 
Shanghai ZSE Z-A

Shanghai ZSE Z-A

Description

The chinese ZSE Z-A was the first incarnation of the “First National Standard Movement”, the first standardized mens’ watch movement. It was made between 1972 and 1974, before it was superseded by the million-seller ZSH series.

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”.

Shanghai ZSE Z-A dial side

Shanghai ZSE Z-A dial side

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.

Technical data

Manufacturer:Shanghai
Caliber:ZSE Z-A
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): China (different types)
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:21600
Size:11 1/4''' (measured: 25,4mm)
Literature: Flume: -

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