Omega R13.5
Description
The Omega R13.5 dates from the 1940ies. It is a ladies' watch form movement, which got its alternative name, caliber 240, in 1949 and was made until the late 1950ies.
main plate
Of course, all important bearings have got jewels, self-evident for Omega.
gear train
The gear train is truely classic with a directly driven minute wheel, third, fourth and escapement wheel. The shape of the base plate allows a large mainspring barrel and also a large screw balance.
side view of the gear train
The large screw balance already beats with 21600 A/h, which was very modern for the time.
It is not shock protected and controls a swiss pallet lever movement.
Omega R13.5 dial side
On the dial side, you see the yoke winding system and the cap jewel of the balance wheel bearing. Besides the balance wheel bearing, no other bearing contains cap jewels.
In the lab
Timegrapher result
As you can see, the balance is the problem here, a new balance wheel is neccessiary. But for occasionally wear, it is still sufficient, the rates are compensating themselves in all positions.| horizontal positions | |||
|---|---|---|---|
| dial up | +29 s/d | 148° | 2.7ms |
| dial down | -7 s/d | 134° | |
| vertical positions | |||
| crown right (12 up) | -270 s/d | 125° | |
| crown up (3 up) | +197 s/d | 201° | |
| crown left (6 up) | +115 s/d | 131° | |
| crown down (9 up) | -300 s/d | 133° | |
Technical data
| Manufacturer: | Omega |
| Caliber: | R13.5 |
| Size: | 6 x 7 3/4''' (measured: 13,4 x 17,5mm) |
| A/h: | 21600 |
| Number of jewels: | 15 |
| Escapement: | Pallet lever |
| Balance types: |
screw balance |
| Shock protection(s): |
none |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | no |
| Adjust mechanism: | Long regulator arm |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 2 hole(s) |
| References: |
Flume: 1952 - |
| Inventory number: | 16012 |
Usage gallery
Omega ladies' watch