Eterna 1408U

 
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Eterna 1408U

Description

The Eterna 1408U is a 11 12 ligne manual wind movent, which was launched in the early 1960ies. The specimen displayed here dates from 1962.

base plate

base plate

The base plate with its perlage below the regulating staff (balance, lever and escapement wheel) reveals its value.

gear train

gear train

The gear train design is very modern for its time. The minute wheel is indirectly driven on the dial side by the large driving wheel, resulting in plenty of space for a large mainsprng barrel and a large Glucydur balance. The latter one still beats slowly with 18000 A/h, but is beared in two inhouse shock protections of type Eterna U.

side view of the gear train

side view of the gear train

This construction with indirectly driven minute wheel and directly driven center second is still used today in the ubiquitous ETA movements, such as the ETA 2824 and its relatives and replicas.

Detail: Ratchet

Detail: Ratchet

An interesting detail is the ratchet, which is a very simple and modern construction, consisting of only two parts, a simple spring and a lever. Both are not fixed and located below the ratchet wheel.

Eterna 1408U dial side

Eterna 1408U dial side

If you ever saw a modern ETA movement from its dial side, you’ll immediately notice the similarities to the Eterna 1408U, especially the minute wheel with its slipping clutch on the cannon pinion, which is driven by the large driving wheel at a 8 clock.

Of course, this movements uses a yoke winding system.

It’s noteable, that this movement still has got a partial minute dial, which was used for adjusting without a timegrapher.

In the lab

The specimen shown here dates from 1962 and must have suffered from a terrible accident. The plates were bent(!), the screws partially blown away and the movement was heavily covered by rust. Because of this, no further service was made.

One detail is very interesting: The large Gluydur balance was not harmed at all and still beats strong like on the first day. Big compliments to the inhouse Eterna shock protections!

Technical data

Manufacturer:Eterna
Caliber:1408U
Number of jewels:17
Escapement:Pallet lever
Balance types: Glucydur anular balance
Shock protection(s): Eterna
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:18000
Size:11 1/2''' (measured: 25,6mm)
Literature: Flume: K2 -
Inventory number:15023

Usage gallery

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