Omega R13.5

 
Omega R13.5

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

main plate

Of course, all important bearings have got jewels, self-evident for Omega.

gear train

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

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

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

The specimen shown here dates from 1947 and shows noticeable signs of wear. The dial of the accompanyhing watch is hardly readable and on the movement there are many traces of rust. Additionally, the balance wheel suffered over time, maybe due to rust or maybe due to shocks, anyhow, its rates on the timegrapher are pretty poor, even after a service.

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:
  • lever
  • escape wheel, seconds wheel
  • third wheel, center minute wheel, mainspring barrel
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

Omega ladies' watch

This movement and watch are a donation from Günter G. Thank you very much for your kind support!

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