Otero 792

 
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Otero 792

Description

In the late 1960ies, Otero launched their last series of selfwinding movements with excenter changer. It contained movements with different functions and different beating rate. The Otero 792 shown here was part of this series and is so one of the few and probably last selfwinding movements from Germany, which uses an excenter changer.

It bases on the manual wind caliber 742, which in turn bases on the caliber 74, adding a date indication.

base plate

base plate

The base plate shows, that all bearings, except those of minute wheel and mainspring barrel, are equipped with rubies.

minute wheel

minute wheel

The gear train is the old-fashioned one with directly driven center minute wheel. At that time, it wasn’t state of the art any more.

gear train

gear train

The gear train has got a directly driven center second.

side view of the gear train

side view of the gear train

The pallet lever movement of swiss type is controlled by a screw less anular balance, which is beared in two Incabloc shock protection bearings. It beats slowly with 18000 A/h and can be adjusted by the hairspring key with a prologed arm.

Otero 792 without selfwinding mechanism

Otero 792 without selfwinding mechanism

The selfwinding mechanism is on top of the movement bridge. This bridge is different to the manual caliber 742, since it is fixed with three screws instead of two.

selfwinding mechanism

selfwinding mechanism

The selfwinding mechanism is plain and simple and consists only of the click wheel and the excenter changer. This changer is moved by two ruby-rolls on the inner side of the oscillating weight. With its two pawls, it ensures, that the click wheel is permanently driven and only in one direction.

When manually wound, the pawls detach the oscillating weight.

excenter changer

excenter changer

The excenter changer has got two springy clicks and a rectangular frame, in which the two ruby rolls of the oscillating weight are located:

lower side of the oscillating weight

lower side of the oscillating weight

The two ruby rolls on the inside of the oscillating weight reduce wear and noise level during their permanently engagement with the frame of the excenter changer.

Otero 792 without oscillating weight

Otero 792 without oscillating weight

With the detached oscillating weight, you can see the simple but genious construction of the selfwinding system, which Otero advertized as “technically perfect” construction.

date indication mechanism

date indication mechanism

The date indication mechanism has got a correction ability by turning the hands back and fourth. Unlike the selfwinding mechanism, it is a complex construction with two springs with good flying abilities.

Otero 792: Dial side

Otero 792: Dial side

Besides that, there are no oddities on the dial side, and of course, the Otero 792 has got a yoke winding system.

Technical data

Manufacturer:Otero
Caliber:792
Number of jewels:25
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Features:SCD,QG,RDR,AUT
Functions:hour, minute, second, day, selfwinding
A/h:18000
Size:11 1/2'''
Literature: Flume: K3 180
Inventory number:17022

Usage gallery

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