Cyma 3

Alpina 755

 
Cyma 3

Cyma 3

Description

Probably from the late 1930s or early 1940s dates this small 8 3/4 ligne movement from Tavannes.

The Cyma 3 was also used by Alpina under their own caliber number “Alpina 755”.

base plate

base plate

The golden color gives this movement a high quality impression, and as you can see on the base plate, this is true.

With 15 jewels, it has got the common and technical minimum required equipment.

gear train

gear train

Of course, the gear train follows the classical standard with directly driven center minute wheel, third wheel, seconds wheel at 6 o’clock (here not prolonges axle for a decentral seconds indication) and finally the steel escape wheel, which has got relatively short teeth.

As escapement, a swiss pallet lever escapement was used.

side view of the gear train

side view of the gear train

The Guillaume screw balance (slotted bimetal balance), which is of course not shock protected, was upper standard that time, since it was able to compensate the temperature deviation of the hairspring.

The effective length of this haiespring was adjusted with a long regulator arm to reach the beating rate of 18000 A/h as precise, as possible.

Since the escape wheel is beared under its own cock, and the seconds and third wheel also have another cock, this movement is very service-friendly.

Detail: Click spring

Detail: Click spring

Another service-friendly detail is the click spring, which is inserted into the mainspring barrel bridge, and which is additionally secured with a recessed screw.

Cyma 3: Dial side

Cyma 3: Dial side

On the dial side, you can see the yoke winding system with its strong setting lever spring.

In the lab

The specimen shown here came as loose movement without case, but with visible water damage and oxidized and even cystal-coated seconds wheel into the lab and got a simple service.

Timegrapher result

You clearly see the age of the movement. The amplitudes are not too high and the positional errors are quite high. Nevertheless, for a movement of this size, they are still not too bad.

horizontal positions
dial up +25 s/d 252° 0.4ms
dial down +14 s/d 274° 0.8ms
vertical positions
crown right (12 up) -12 s/d 230° 0.6ms
crown up (3 up) +95 s/d 215° 1.1ms
crown left (6 up) +19 s/d 216° 1.0ms
crown down (9 up) -110 s/d 239° 0.5ms

Technical data

Manufacturer:Cyma
Caliber:3
Size:8 3/4''' (measured: 19,0mm)
A/h:18000
Number of jewels:15
Escapement:Pallet lever
Balance types: Guillaume screw balance (two legs)
Shock protection(s): none
Moveable stud:no
Adjust mechanism:Long 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:3 hole(s)
References: Feilner: 30
Flume: 1947 21
Jacob: 1942 9 11016
Inventory number:21019

Usage gallery

Alpina ladies' watch  (case missing)

Alpina ladies' watch (case missing)

anonymous ladies' watch  (case missing)

anonymous ladies' watch (case missing)

The movement in the Alpina version is a kind donation from Philipp Porter. Thank you very much for your great support of the movement archive!

Other movements from Cyma