For sale is a large working quarter chime Gustav Becker Mantel clock with original key. It has following information on the mechanism which I have included in the photos. It has a Gustav Becker anchor mark and P14 - which I believe is related to the pendulum size. Finally there is a serial(?) number of 773 which I believe would make this a very early clock although I am no expert. It is working and is a larger example of a mantel clock.