The Otero 722 is a classical manual wind movement from then 1960ies. It has no technical specialities, but a characteristic date indication at 6 o’clock.
The execution of this movement is impeccable, all important bearings contain rubies, only the center minute wheel lacks a ruby bearing on the dial side.
It still has a directly driven center minute wheel, which is beared under an own cock. This cock contains a ruby bearing.
Probably this movement was also available in a smaller, 10 1⁄2 ligne, version, since you can see, that the outer part of the base plate is only used for extending the size. The complete gear train needs only the inner space of the movement.
The gear train is a typical classic one: The mainspring barrel directly drives the center minute wheel, followed by the usual two-storey construction with third wheel and center second wheel. At the end of the gear train, there’s the steel made escape wheel, whose two bearings contain cap jewels.
The modern shaped, screw-less three-leg anular balance still beats withen 18000 A/h and is beared in two Incabloc shock protection systems.
As escapement, a classical swiss pallet lever is used.
Of course, the Otero 722 has got a yoke winding system, whose setting lever spring only has got one single hole.
The hour wheel drives a change wheel and then the date ratet with a fixed finger. This construction allows a semi-fast correction of the date by turning the hands back and forth a few hours. The date itself changes slowly between 10 and 12 pm.
|Number of jewels:||17|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||1 hole(s)|
|Functions:||hour, minute, second, day|
|Size:||11 1/2''' (measured: 25,4mm)|
Flume: K3 35|