Replaced bad PCB board on "Time Machine" rolling ball clock with a 1rpm motor : r/clocks
Ball Clock for sale | eBay
How To Get Your Own Idle-Tyme. The Original Rolling Ball Clock
Rare Vintage French Style Mystery 8 Day Waterwheel Rolling Ball Industrial Clock For Sale at 1stDibs | water clock for sale, ball bearing clock, water wheel clock
Ball bearing" Clock for Sale by vectorworks51 | Redbubble