The tonneau-shaped Cyma R.384K was an exceptionally well executed ladies’ watch movement, which launched in the 1940ies and got an upgrade to the inhouse Cymaflex-II shock protection around 1960.
At first glance yet it impresses with its extensively decorated appearance.
Of course, all fast revolving bushings of this movements are equipped with synthetic rubies, on the gear train bridge, they are even housed in pressed chatons.
The movement side escape wheel bearing is not only equipped with a cap jewel, but also with a shock protection of the bearing ruby. A really interesting detail!
The gear train is the classical one: The maximum large mainspring barrel directly drives the center minute wheel, followed by third wheel, fourth wheel and stell lever wheel. The latter one is located partially below the bearing of the fourth wheel.
This two-storey construction is typical for tonneau-shaped movement, which always have problems with the available space.
The screw balance beats with 18000 A/h and regulates a classical swiss pallet lever movement. It is secured by a characteristically shaped Cymaflex-II shock protection. Typical for Cyma is the use of a balance bridge instead of a simple balance cock.
On the dial side, there’s a shock protection for the cap jewel of the balance bearing.
Of course, the Cyma R.384K uses a yoke winding system. A nice detail is, that the winding pinion has got helical teeth. On the movement side, the crown wheel has got two additional intermediate changes, before the the ratchet wheel is used.
|Number of jewels:||17|
Nickel screw balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Size:||6 3/4 x 8'''|
Flume: 1944 81|