The Junghans 623 and the also constructed Junghans 625 (with Automatic assembly) are the last by Junghans produced mechanical movements and are considered very mature. The shown caliber is a rare version of the movement, since it has a shock absorber of the escape wheel.
Unfortunately, in a failed attempt of a previous holder to remove the acrylic glass it broke at the edge of the bezel and a new glass was simply glued. An object for long winter evenings: scratching the broken glass remaining behind the bezel ring, without suffering the ring and the dial ...
Here is the version of the Junghans 623.20 without shock absorbing system for the escape wheel. The watch has a steel case and in origin there is a sunray cut on the surface.