Cyma 416Ka

 
Cyma 416Ka

Cyma 416Ka

Description

The Cyma 416Ka, a 10 1/2 ligne windup movement from the late 1940s with indirect center seconds indication and inhouse shock protection origins from the swiss city of Tavannes.

base plate

base plate

Quality-wise, this movement is made very well. On the base plate, you see a very nice perleage in the visible area, and of course, all important bearings contain rubies.

The upper side of the gear train and mainspring barrel bridges have a strip decoration, which unfortunately cannot be really seeon on the photo.

inside the gear train bridge

inside the gear train bridge

The three ruby bearings of the gear train bridge are beared in chatons.

gear train

gear train

The Cyma 416Ka uses the classical gear train with directly driven center minute wheel, third wheel, seconds wheel and filigree steel escape wheel.

The indirect center seconds pinion is driven by a second wheel on the upper pinion of the third wheel. A thin spring prevents the center seconds pinion from fluttering by applying a little bit of force sideways.

side view of the gear train

side view of the gear train

The swiss pallet lever movement of this movement is regulated by a monometallic screw balance, which beats contemporarily slow with 18000 A/h and can be adjusted with a long regulator arm with specially shaped end.

The balance is secured in an inhouse Cymaflex-I shock protection.

Cyma 416Ka: Dial side

Cyma 416Ka: Dial side

On the dial side, too, there are very beautiful perleages. Aesthetically, this movement is really top notch and technically, with its early inhouse shock protection and its yoke winding system, it is very well made, too.

In the lab

The speciem shown here came without surrounding case and dial into the archive and got a simple service.

Timegrapher result

In the horizontal positions, the rates are pretty impressive, but with a little low amplitude; vertically, you see the age and wear of this movement, since the amplitude breaks in heavily, altough the variance of the rates is gratifying low.
Really impressive is the very low bear error. On a movement with fixed hairspring stud, this is amost impossible to achieve.

horizontal positions
dial up -1 s/d 190° 0.1ms
dial down +-0 s/d 217° 0.1ms
vertical positions
crown right (12 up) -27 s/d 195° 0.0ms
crown up (3 up) -35 s/d 195° 0.2ms
crown left (6 up) +-30 s/d 186° 0.2ms
crown down (9 up) +-26 s/d 186° 0.4ms

Technical data

Manufacturer:Cyma
Caliber:416Ka
Size:10 1/2''' (measured: 23,3mm)
A/h:18000
Number of jewels:15
Escapement:Pallet lever
Balance types: monometallic screw balance (two legs)
Shock protection(s): Cymaflex I
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel, mainspring barrel
  • center second pinion
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Features:
  • SCI (indirect center seconds)
References: Ebauches: 1949 47
Feilner: 2607a
Flume: 1958 b.32
Inventory number:21009
This movement is a kind donation from Mario to the movement archive. Thank you very much for your great support!

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