MST 422

 
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MST 422

Description

In the mid 20th century MST (Roamer) launched many high quality movements. One of the is the 8 3/4 ligne caliber MST 422, a movement for ladies' watches with decentral seconds indication.

It bases on the caliber MST 367, but already uses a moveable hairspring stud.

MST 422: base plate

base plate

Of course, all important bearings contain rubies. Without cap jewels, the movement only uses 15 jewels, even when the dial of the archived example interestingly adverties 17 jewels.

The rubies on the gear train bridge have a chaton-like edging.

MST 422: gear rain

gear rain

The gear train uses the classical construction with mainspring barrel, center minute wheel, third wheel, decentral seconds wheel at position 6 o’clock and finally the escape wheel.

MST 422: side view of the gear train

side view of the gear train

A monometallic screw balance is used, which slowly beats with 18000 A/h. Its precise frequency can be adjusted at the hairspring key only.

The modern execution of the movement can be seen on the moveable hairspring stud and the Incabloc shock protection for the balance wheel.

MST 422: MST 422: Dial side

MST 422: Dial side

On the dial side, you see the yoke winding system, and at position 6 o’clock, there’s a large bearing jewel for the decentral seconds indication.

As common for the time, this movement is slanted on its outer rim, too, to save a little height.

Technical data

Manufacturer:MST
Caliber:422
Caliber base:MST 367
Size:8 3/4''' (measured: 19,4mm)
A/h:18000
lift angle:49°? 52°?
Number of jewels:15
Escapement:Pallet lever
Balance types: monometallic screw balance (two legs)
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:no/yes
Adjust mechanism:Short regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:4 hole(s)
Features:
  • s (decentral seconds)
References: Ebauches: 1959 Sup. 2 84
Feilner: 62 6214
Flume: K2 -
Inventory number:22015

Usage gallery

MST 422: Roamer ladies' watch

Roamer ladies' watch

This movement with the Roamer watch is a kind donation from Philipp Porter to the movement archive. Thank you very much for your great support!