Otero 441
Description
This movement, which bases on the Otero 44 and therefor is stamped as “Otero 44” contains a directly driven center second and a date indication, realized with a disc.
The screw balance is beared in two Monorex shock protection systems and the effective length of its hairspring is regulated by a long regulator arm.
version with screw-less balance and Otex-shock protection
To get the high number of 21 functional jewels, on this version, the escapement wheel, fourth and third wheel are beared with cap jewels, although on the specimen shown here, two of them are missing. The balance wheel is beared in two inhouse Otex shock protection systems (which are normally used for axle bearings), round, but 6-shaped on its outer side.
Otero 441 dial side
On the dial side you see the attached date mechanism, which consists only of a date disc and a driving wheel (located invisibly below the date disc). The disadvantage of this construction is, that the diameter of the disk is small and the date window and numbers have to be small, too.
dial side view without date mechanism
The movement is wound by a rocking bar winding mechanism, but here at well made click mechanism is used.
Technical data
| Manufacturer: | Otero |
| Caliber: | 441 |
| Size: | 10 1/2''' (measured: 23,2mm) |
| A/h: | 18000 |
| Number of jewels: | 17/21 |
| Escapement: | Pallet lever |
| Balance types: |
Nickel screw balance Nickel anular balance |
| Shock protection(s): |
Monorex Otex (Otero) |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | no |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | rocking bar winding system |
| Setting lever spring: | 4 hole(s) |
| Features: |
|
| References: |
Flume: 1957 34 |
Usage gallery
Prätina gents watch (dial only)
Links
* [Ranfft Uhren: Otero 441](http://ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&102&2uswk&Otero_441)
This movement in the version with screw balance was donated by [Klaus Brunnemer](index.php?option=com_content&view=article&id=62:donated-movements-of-klaus-brunnemer&catid=10&lang=en-GB&Itemid=201). Thank you very much!