Our 10yr old has gotten ***REALLY*** into mechanical watches & clocks to the point he's on the verge of starting a side gig repairing them. He mentions his hobby to everyone, and a lot of folks have a not-quite-working item sitting around. He's fixed a number of them.
He has had a tough time with an civil war era pocket watch, but was finally able to salvage a compatible part from somewhere, and he got it ticking today. He was so proud, and wants to share with everyone.