Uwersi 57/8
Description
In 1950, Helmut Epperlein founded the Uhren-Werk Ersingen (Uwersi) in Pforzheim, Germany, which also operated under the name “Vereinigte Uhrenfabriken Ersingen” and mainly mass-produced simple raw ebauches.
Video on YouTubeThe caliber Uwersi 57/8 shown here is a 10 1/2 ligne pin lever movement with subseconds indication.
Uwersi 57/8 with larger drillings
Of this movement, there are implementations known with two jewels (Ellipse and dial side bearing of the balance) as well as with five jewels (with additional movement-side bearing of the balance, and dial side bearing of third and second wheel).
Fitting accuracy of the holes
Based on the different diameter and qualities of the drillings and bearings, you can speculate, whether there were different revisions available or whether the manufacturing precision changed during the production period.
base plate
Further revisions were also available with date indication and pin lever with ruby pins.
gear train
There gear train consists of four wheel, which are all located under one large bridge. It is a classical construction with decentral second indication at “6 o’clock” and a directly driven minute wheel.
Side view of the gear train
The flat and light annular balance is not shock protected and beats slowly with 18000 A/h. The caps of its bearings only consists of metal plated.
The balances controls the movement by a pin lever. The escapement wheel has got an odd construction, it looks, like there were two different metals connected.
Detail: Escapement wheel
It can only be guessed, why on the five-jewels version, the third and second wheel have got ruby bearings on the dial side and not both bearings of the more important escapement wheel.
Uwersi 57/8 dial side
The Uwersi 57/8 has got a quite crudely shaped out escapement lever cock on the dial side and it’s lacking a ratchet mechanism. Only a simple spring interposes the ratchet wheel, which is driven by a rocking bar winding mechanism.
dial side, version with 2 jewels
On all versions, you can easily spot the preparation holes for a cap jewel pair of escapement- and third wheel. The version with 21 jewels makes extensive use of cap jewels.
In the lab
Timegrapher result
| horizontal positions | |||
|---|---|---|---|
| dial up | +44 s/d | 164° | 2.5ms |
| dial down | -54 s/d | 189° | 3.1ms |
| vertical positions | |||
| crown right (12 up) | -125 s/d | 130° | 3.8ms |
| crown up (3 up) | -150 s/d | -° | -ms |
| crown left (6 up) | -147 s/d | 134° | 3.8ms |
| crown down (9 up) | -138 s/d | 127° | 3.8ms |
Technical data
| Manufacturer: | Uwersi |
| Caliber: | 57/8 |
| Size: | 10 1/2''' (measured: 23,2mm) |
| A/h: | 18000 |
| Number of jewels: | 2/5 |
| Escapement: | Pin lever |
| Balance types: |
Nickel anular balance |
| Shock protection(s): |
none |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | no |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Construction type: | pillar construction |
| Winding mechanism: | rocking bar winding system |
| Setting lever spring: | 3 hole(s) |
| Features: |
|
| Production period: | 195x |
| References: |
Flume: 1957 43 |
Usage gallery
Shaon mens' watch