The old style is one with a round spring that goes up and down (Vertical). By this time the Urgos units were out of production. Around this time there was a switch to the new style on the Hermle units.
Use of the old style was all through the 70's and 80's and 90's. Out of these, two styles, the old style and then the new style. For example, movements in the Urgos 6/ series and many of the Hermle clock movements. These notes are only for the larger balance wheel in the top center of the clock movement. The platform escapement can be read about in another section. This section is for those balance units that do not have a platform escapement. There are three types of clock balance movement styles post 1950.
Balance Clock Movement Timing is done fairly easy.
