Otero 441

 
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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

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

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

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
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:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Winding mechanism:rocking bar winding system
Setting lever spring:4 hole(s)
Features:SCD,QG
Functions:hour, minute, second, day
A/h:18000
Size:10 1/2''' (measured: 23,2mm)
Literature: Flume: 1957 34

Usage gallery

Prätina gents watch  (dial only)

Prätina gents watch (dial only)

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