I’ve seen the clock, as it was in the neighborhood where I went to college. There’s several of them, and it is constructed one level above the Playskool variety. What makes it ridiculous is that it can go backwards as well forwards, which makes it not a clock at all, but more of an abacus. Finally it only shows the hours from 9-12, so even going back to the stone age will bring it no farther back than three hours.
At the time, we were thinking of stealing the clock and take a picture of us moving the hands to midnight to see what would happen. With multiple clocks, there wasn’t much point.