Osco 66D

Osco 66D | 17jewels.info - The Movement Archive

Osco 66D


The Osco 66D is a well equipped movement of german production: It contains a screw balance (or a golden toned ring balance in later issues), which is beared in a Trishock-like shock protection system, a direct driven center second indication and a date display by a date wheel. Only the rocking bar winding mechanism is a tribute to the economical fabrication of this movement.

This movement uses a number of cap jewels on the escapement and escapement wheel (on the dial side).

Osco 66D: version with screw-less balance

version with screw-less balance

Osco 66D: Osco 66D dial side

Osco 66D dial side

Osco 66D: Zifferblattseite without date disc

Zifferblattseite without date disc

Technical data

Size:10 1/2'''
Number of jewels:17
Escapement:Pallet lever
Balance types: Glucydur screw balance
Nickel anular balance
Shock protection(s): ?
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Winding mechanism:rocking bar winding system
Setting lever spring:3 hole(s)
  • SCD (direct center seconds)
  • QG (date indication (aperture))
References: Flume: 1957 36

Usage gallery

Osco 66D: Osco Parat ladies' watch

Osco Parat ladies' watch

Osco 66D: Bergana gents watch

Bergana gents watch