MST 414

 
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MST 414

Description

In the late 1950ies, flat watches became popular, and it was neccessiary to construct extra flat movements.

The MST 414 shown here belongs to that class of movements. It was available from 1961 and shows very good rates.

base plate

base plate

Of course, all important bearings contain rubies, even the minute wheel. For the escape wheel, there’s a KIF Duofix cap jewel on the dial side.

base plate with minute wheel

base plate with minute wheel

This movement still has a directly driven center minute wheel, which is beared below its own bridge. It’s a bit odd to use this outdated construction for an extra flat movement, while the state-of-the-art construction with a second wheel and indirectly driven hands on the dial side, was already available and allowed even more flat movements. But probably MST wanted to be on the safe side.

gear train

gear train

We have the classical gear train here with directly driven minute wheel, third wheel, center second wheel and escape wheel.

side view of the gear train

side view of the gear train

The three leg Glucydur balance still beats with 18000 A/h. It regulates a conventional swiss pallet lever movement and is beared in two Incabloc shock protection bearings. The exact frequency can be adjusted with an excenter and for mimimizing the beat error, a moveable hairspring stud was used.

This was more or less the best combination available at that time.

MST 414: Dial side

MST 414: Dial side

On the dial side, you see the yoke winding system. Since the plate is a bit slanted on the outer side, it helps to reduce a little height.

At 9 o’clock, you can see the dial side Incabloc bearing, and around 7 o’clock, there’s the KIF Duofix cap jewel bearing for the escape wheel.

In the lab

The tested specimen was in relatively good condition, but its surrounding case showed a shock-caused crack, and the center seconds wheel was broken.
It got a simple service, cleaning and adjustment.

The rates are really good, and it’s likely, that without the damages, it might even run within chronometer specs.

Timegrapher result



horizontal positions
dial up +19 s/d 260° 0.4ms
dial down 0 s/d 289° 0.0ms
vertical positions
crown right (12 up) -3 s/d 253° 0.6ms
crown up (3 up) 0 s/d 248° 0.0ms
crown left (6 up) -9 s/d 232° 0.0ms
crown down (9 up) -9 s/d 235° 0.6ms

Technical data

Manufacturer:MST
Caliber:414
Number of jewels:17
Escapement:Pallet lever
Balance types: Glucydur screw balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Excenter
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:3 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:18000
Size:11 1/2''' (measured: 25,2mm)
Production period:1961 - 1973
Literature: Flume: K2 -
Inventory number:18032

Usage gallery

Roamer gents watch

Roamer gents watch

Links

This movement is a kind donation from V.Weigmann. Thank you very much for the great support of the archive!

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