ETA 1150

 
ETA 1150

ETA 1150

Description

One of the more seldom to find movements is the form movement ETA 1150, a contemporary, rather flat windup movement with a size of 5 1/4 x 8 3/4 lignes, perfectly suited for the tiny rectangular ladies’ watches, whose size was liked to hide to let them appear more elegantly.

base plate

base plate

The 15 jewels it uses, is the standard of a good quality pallet lever movement, and below the pretty large screw balance there’s also a perleage.

gear train

gear train

Due to its small size, which allows a rather large mainspring barrel and balance, though, the gears are pretty small, especially the really tiny seconds wheel.

side view of the gear train

side view of the gear train

To save space, the lower bearing of the seconds wheel is located in half height, below, there’s place for the normally sized escape wheel.

The two leg screw balance is not yet shock protected. Its slow beating rate of 18000 A/h can only be adjusted with the hairspring key, since there’s no long regulator arm.

ETA 1150: Dial side

ETA 1150: Dial side

On the dial side, you can see besides the yoke winding system with its very characteristic setting lever spring, how there was a fight for every 1/10 of a millimeter of height:
On top and and the bottom, you can see how the base plate is slanted on the dial side, on the botton, the mainspring barrel is partially uncovererd and on top, the cap jewel bearing for the dial side balance wheel is partially cut.

Technical data

Manufacturer:ETA
Caliber:1150
Number of jewels:15
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Hairspring key
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)
Functions:hour, minute
A/h:18000
Size:5 1/4 x 8 3/4''' (measured: 13,0 x 19,6mm)
Literature: Flume: K1 -
Inventory number:20012

Usage gallery

Svalan ladies' watch

Svalan ladies' watch