ETA 2412
Description
With a diameter of just 6 3/4 lines, the ETA 2412 is one of the smallest ladies’ watch movements on the market in the 1950s and 60s. Dugena gave it the internal designation Dugena 1201.
Version "Dugena 1201"
Over the course of its long production run, it was available in different versions, such as with screw balances of varying quality:
Version with Glucydur screw balance and fixed balance stud carrier
Version with two-armed screw balance and fixed spiral stud carrier
Of course, there were also screwless versions, also in varying qualities:
Version with screwless Glucydur balance wheel
Version with screwless, three-armed annular balance wheel
Und selbst bei der Farbwahl gab es mehrere Varianten:
Gold-colored version with Glucydur balance wheel
Copper-colored version with Glucydur balance wheel
Copper-colored version with an annular balance wheel
Regardless of the version used, they were always impeccably crafted, as can be seen, for example, in the bearing fittings of the baseplate: all important bearings are equipped with rubies.
base plate
What’s special about this movement is that it no longer uses a directly driven center minute wheel, but instead, for space reasons, the hands are indirectly driven by the pinion of the third wheel on the dial side. The second wheel at the edge of the movement engages with the mainspring barrel.
gear train
The advantage of this design is that both the mainspring barrel and the balance wheel can be made very large in diameter, which on the one hand ensures a sufficiently long power reserve, and on the other hand ensures stable and good timekeeping.
Unfortunately, during assembly, the gear train is almost impossible to assemble without the mainspring barrel, and very difficult to assemble even with the mainspring barrel.
side view of the gear train
All versions use a balance wheel that oscillates relatively quickly at 21,600 A/h which is shock-protected by a pair of Incabloc shock protection devices. The slower oscillation (18,000 A/h) version of this movement is the ETA 2410.
The adjustment, at least in the versions presented, is always made directly on the hairspring key; the balance spring stud carrier is still fixed to the balance cock in the older versions, newer versions already have a movable hairspring stud carrier with which the beat error can be corrected.
ratchet
The ratchet is mounted below the ratchet wheel.
empty dial side
On the dial side, one can see the familiar ETA construction with the yoke winding mechanism, the adjustment minute track, the preparations for the addition of further cap jewels (in the 17-jewel version) and the non-jeweled pinion of the third wheel (at position “8”), which drives the center minute wheel on the dial side.
w/o hour wheel
The minute wheel is connected to the cannon pinion via a slip clutch, into which the change wheel engages, which in turn turns the hour wheel.
ETA 2412: Dial side
As already shown on the movement side, different colored versions can also be admired on the dial side:
dial side, gold finish
dial side, copper-colored finish
In the lab
Timegrapher result
Considering the movement came from a “slaughterhouse watch,” the measured values are quite acceptable. They would certainly be significantly better in better condition.| horizontal positions | |||
|---|---|---|---|
| dial up | +5 s/d | 234° | 0.5ms |
| dial down | +-0 s/d | 251° | 0.1ms |
| vertical positions | |||
| crown right (12 up) | -15 s/d | 217° | 0.7ms |
| crown up (3 up) | -15 s/d | 219° | 0.2ms |
| crown left (6 up) | -24 s/d | 218° | 0.1ms |
| crown down (9 up) | -24 s/d | 211° | 0.6ms |
Technical data
| Manufacturer: | ETA |
| Caliber: | 2412 |
| Caliber base: | ETA 2410 |
| Size: | 6 3/4''' (measured: 15,3mm) |
| Height: | 3,40mm |
| A/h: | 21600 |
| lift angle: | 51° |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: | Glucydur screw balance (two legs) Glucydur anular balance (three legs) monometallic screw balance (two legs) monometallic anular balance (three legs) |
| Shock protection(s): | Incabloc |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | no/yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 2 holes |
| References: | Feilner: Bl. 62 6202 Flume: 1962 12 |
| Mentioning in literature (years): | 1964 - 1976 |
| Inventory number: | 25012 |
Usage gallery
Precimax ladies' watch
Dugena ladies' watch (case missing)
Roamer Damenuhr
Felca ladies' watch(case missing)
Habmann ladies' watch(case missing)
Voumard ladies' watch(case missing)
Miramar ladies' watch(case missing)
anonyme ladies' watch(case missing)
Arola ladies' watch(case missing)
Eusi ladies' watch(case missing)
Priosa ladies' watch (case missing)