PUW 1075
Description
The tonneau-shaped PUW 1075 with a diameter of only 5 1/2 lignes is a very typical product of the 1960s and was also used by Dugena, under their own caliber number Dugena 2500.
Version "Dugena 2500"
It was from the mid 1960s the successor of the PUW 74. Since it successfully passed the german state quality inspection in 1967, among other things, it can be assumed that it was on the market from the mid-1960s onwards.
From the base plate, one can see that it is of high quality. Even the bearing of the minute wheel is equipped with a jewel, and the bearing jewel of the escape wheel is noticeably large.
base plate
The gear train follows the usual standard of such tonneau movements: The mainspring barrel is followed by the central minute wheel, third wheel, seconds wheel, and escape wheel.
For space reasons, the lower seconds wheel bearing is located above the escape wheel, effectively creating a one-and-a-half-story structure.
gear train
In contrast to its predecessor PUW 74, the beat rate of the balance was increased from 18,000 to 21,600 A/h, and this is also marked on the balance cock. Adjustment is carried out using the extended hairspring key, which features a hole for precise gripping.
The screwless annular balance is shock-protected in a pair of Rufa anti-shock bearings.
side view of the gear train
The click spring is housed in a recess under the ratchet wheel.
ratchet
On the dial side, in addition to the yoke winding mechanism and the Rufa anti-shock protection, the relatively large jewel bearing of the escape wheel is particularly striking.
PUW 1075: Dial side
In the lab
The Dugena specimen tested on the timegrapher arrived in good condition, so there was no need for a service.
Since it ran a bit fast, it was adjusted minimally, so that the mean deviation is pretty low now:
The ampliture readings refer to the standard lift angle of 52°. It's not known, what is the real lift angle of the PUW 1075.
But according to the timegrapher result, this movement seems to have a large position error, maybe caused by a shock. Otherwise the rates are absolutely OK for a movement of that tiny size.
Timegrapher result
| horizontal positions | |||
|---|---|---|---|
| dial up | -23 s/d | 225° | 0.1ms |
| dial down | +16 s/d | 239° | 0ms |
| vertical positions | |||
| crown right (12 up) | +2 s/d | 201° | 0.6ms |
| crown up (3 up) | +2 s/d | 206° | 0.2ms |
| crown left (6 up) | -33 s/d | 196° | 0.1ms |
| crown down (9 up) | -20 s/d | 197° | 0.3ms |
Technical data
| Manufacturer: | PUW |
| Caliber: | 1075 |
| Size: | 5 1/2''' (measured: 13,0 x 15,1mm) |
| A/h: | 21600 |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: | Nickel anular balance |
| Shock protection(s): | Rufa-Anti-Shock |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 holes |
| Attachment of setting lever: | screwed |
| References: | Flume: K3 77 |
| Mentioning in literature (years): | 1967 - 1971 |
| Inventory number: | 24020 |
Usage gallery
Dugena ladies' watch
ZentRa ladies' watch