In the pats few years, we have covered plenty of unique clocks here. These flying pendulum clocks are also worth a look. These were made in all kinds of sizes and designs. They have a flying pendulum escapement mechanism with a small metal ball connected by a string that wraps around one post, then unwinds before repeating on the other brass post.
The above video shows the Horolovar Ignatz & Tomy Guildclock Micro Flying Pendulum Clocks in action. You can find them on eBay.