ETA 415

 
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ETA 415

Description

If you think of ETA, you think of all those modern selfwinding movements, which ETA produced after WW II, and which still power most of the mechanical watches in the upper price range on the market.

It’s less known, that the ETA also produced many cylinder movements in their early days, but not many of them survived until today. Watches with cylinder movements were found in the lower price range and due to their lack of precision and reliability they were not really loved.

The ETA 415 shown here probably originates from the 1930ies. It is a rather small cylinder movement, elliptically shaped for the popular Art Deco watches of that era.

base plate

base plate

Interestingly, on this movement, the plates are made of nickel silver and not of brass, as on most other cylinder movements. This gives the movement a much more modern touch.

gear train

gear train

The gear train is the usual one for a cylinder movement: The mainspring barrel drives the minute wheel, then we have got fourth and third wheel and finally the inidividually beared cylinder wheel. All gears are ruby beared, the cylinder wheel has got its own flat cock, because it lies under the balance wheel.

side view of the gear train

side view of the gear train

The three-leg, flat anular balance with its cylinder tampon is not yet shock protected. It beats with 18000 A/h and is located in its own balance block, which can be removed from the movement:

bottom of the balance block

bottom of the balance block

On the dial side, you see, that the ETA 415 already uses a modern yoke winding system.

ETA 415 dial side

ETA 415 dial side

At 6 o’clock you can spot the old ETA hallmark, which was used unil the end of the 1930ies.

In the lab

The specimen shown here was lacking a few parts of the winding and time setting mechanism, and since it’s a cylinder movement, it could not be measured on a modern timegrapher.

Technical data

Manufacturer:ETA
Caliber:415
Number of jewels:10
Escapement:Cylinder
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • center second pinion
  • large driving wheel, third wheel, center minute wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Functions:hour, minute
A/h:18000
Size:6 1/2''' (measured: 15,0 x 25,1mm)
Literature: Flume: 1947 145
Inventory number:16006