Ring Clock

The ring clock works like a windup toy would work, there is a metal spring wound a few times around the inside of the ring and fixed in place at the inner most end.
The other end of the spring is fixed to the inside of the outer part of the ring.
When the outer part of the ring is twisted, the spring tightens and slowly unwinds, making the outer part turn - the clock numbers are spaced evenly around the outside of the ring, and the time will be told from a marker.
To stop the ring from being slowed by other fingers, a thin transparent layer will go around the ring, fastened in place on the inner part. This will slide lengthways (in relation to the finger) when it needs to be moved to wind the ring up again, and can have the marker on it by which the wearer reads the time.