ETA 651
Description
From the 1930s dates this extremly shaped ladies' watch movement, which is only 10.2mm (4 1/4 lignes) small, but 22.8mm (10 lignes) long.
Hard do believe, but watches in this extreme shape were very popular that time.
base plate
With the 15 jewels, the ETA 651 has got, all important bearings contain rubies.
It’s noteable, that the mainspring barrel has got a pretty large diameter, but there’s still unused space, which would have allowed an even larger barrel.
gear train
We have the classical gear train here, with directly driven center minute wheel, followed by the rather small third and fourth wheel and finally the steel escape wheel.
side view of the gear train
The non shock protected screw balance is made of two different metal layers, but its not slittet like a normal bimetal balance.
It beats with 18000 A/h, controls a swiss pallet lever escapement and can be adjustet with a long regulator arm.
ETA 651: Dial side
The ETA uses of yoke winding system, of course.
If you look closely, you can see the old ETA hallmark. It was only used until the late 1930s, before it was replaced by the Ebauches Shield with ETA letters inside.
Technical data
| Manufacturer: | ETA |
| Caliber: | 651 |
| Size: | 4 1/4 x 10''' (measured: 10,2 x 22,8mm) |
| A/h: | 18000 |
| Number of jewels: | 15 |
| Escapement: | Pallet lever |
| Balance types: |
bimetallic screw balance (two legs) |
| Shock protection(s): |
none |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | no |
| Adjust mechanism: | Long regulator arm |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 hole(s) |
| References: |
Ebauches: 1948 4 Flume: 1944 76 Jacob: 1942 26 |
| Inventory number: | 20056 |
Usage gallery
Para ladies' watch (without case and hands)