Osco 72

 
Osco 72

Osco 72

Description

The Osco 72 is a rather modern ladies’ watch form movement, which is relatively large with its size of 6 34 x 8 lignes.

It contains 17 jewels, with four of them (both bearings of the escapement wheel and the lever) being made of transparent material. Probably, they wanted to test new, cheaper materials, for the most critial bearings?

The mainspring barrel is beared in one jewel on the movement side, which is a bit odd. Technically, there’s no need for it, but with that bearing, the number of jewels sums up to 17.

A pretty large ring balance, which is beared in two KIF Trior shock protections, controls the movement. Its hairspring is of course connected to a moveable stud but can be regulated in its effective length only directly at the hairspring key.

The escapement wheel is large, too, and noteably thin and fragile. Maybe, it was espected to enhance the precision at low or no costs.

Osco 72 dial side

Osco 72 dial side

On the dial side, you see the rocking bar winding mechanism, which shows a bit the cost-efficient construction of this movement.

Technical data

Manufacturer:Osco
Caliber:72
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): KIF Trior
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
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:2 hole(s)
Functions:hour, minute
A/h:18000
Size:6 3/4 x 8''' (measured: 14,9 x 17,95mm)
Literature: Flume: K3 87

Usage gallery

Osco ladies' watch

Osco ladies' watch