that was my answer.....6 volts..there is 2 wires going to the clock,,,,one for light...one for clock works
there is a cover on the back of the clock thatu can move it over t the "f or to the "s" i set the time and tried to wind itccw and cw u could here it tick a couple a times then it stops, the light works on the clock
For best results, take that clock out and get your local watchmaker to clean it for you and test it. He can set it for F or S and you just reinstall it and know what time it is as long as the battery and mainspring last.