The Rubiks Clock was a 2 sided device featuring 18 clock faces. If you turned one of the 4 corner cogs, some clocks would rotate on the front face, but different clocks would rotate on back. The idea was to get all the clocks pointing to 12 O'Clock. My mate told me how to work out what to do, and after a few weeks practise, I could do it in about 29 seconds.
Do You Remember Rubik's Clock?
Do You Remember Rubik's Clock?