I thought TexasLaser's gear clock was the most clever use of the space, but by not embedding the fonts, no one could print it. So I made a new one with more computery fonts for myself. The original file also had nearly 8 types of cuts in it, which I just did not understand, so I reduced it down to black for engraving parts, red for cuts. If I made a mistake, I hope someone will tell me, I've not done much laser cutting yet.
There are numerous small gears for, I assume, different types of clock motions. Choose the one that will work for you, stack two of them and glue them to the minute hand and toss the rest.