Schatz Royal Mariner Mechanical Boat Clock and Key

This is a mechanical boat clock made by Schatz in Germany between 1960 and 70, a Royal Mariner. I ran it for 2 days and it lost or gained no time. It tones every half hour, starting with 1 ring of its bell with another ring added every half hour until it reaches 8 tones and starts over. It is brass covered and its glass door still works and has its latch. It is meant to be screwed into a wall and won't work well if you lay it down on its back. A number 7 key is included to wind it and there is wear to the clock as in the pictures. This clock is 7" in diameter and is about 3 5/8" deep.