There are watches that are called "slow watch" which has a single hand and a dial that goes from 0 to 24. They kinda make more sense than regular watches.
I have one, and that they do, except for the people trying to sneak a glance of the time haha. "Huh?"
I rather love mine, to me there's little reason to prefer a 12 hour clock when you have minute and second hands on the 24 also (my version does, it's not a "slow watch")