The following clock is a synchronous/mechanical clock. When the electric mains supply (220V) is available a synchrounous motor powers the clock and winds a mechanical mainspring. If there is a power failure the mechanical portion of the clock continues to run - powered by the mainspring.
The clock was a GPO (General Post Office) clock, until 1989 when is stopped working and was thrown out. My father acquired it and has given it to me. It looks like the only problem with it is that it's a bit dirty and needs a clean.
In this photo you can see the synchronous motor at the back of the clock movement and all the mechanical gearing - including the main spring. The grey metal case dimensions are 100mm x 70mm x 40mm, and the text on it reads: '220 Volt Wechselstrom' (Wechselstrom is German for alternating current). There is also the number 718 stamped on the case which may be a model number. I placed a penny in the photo to give an indication of size. 
In this photo the mechanical balance wheel and escape wheel are visible.
220 Volt synchronous motor
If anyone has any information about this clock (or a similar one) I'd be very keen to hear from you.
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