Mechanical Watch: Exploded View

This is such a cool idea! You could potentially sell this or contact some watchmakers!

This is a labor of love, there’s no way the 15+ hours would be worth it commercially.I think it’s cool and if you start looking at things like this as a business idea they get unfun really fast.

There is currently no competition, so he gets to set the price.

Except that above a certain price, demand falls to zero.

The question is whether there is any overlap at all where the price would be high enough to motivate supply (worth it to him) but low enough that there's still demand (worth buying). Also factoring in the cost of marketing, since potential buyers don't just automatically find you.

There are a huge number of business ideas where there is no overlap at all. Finding an overlap even without competition is hard enough. (Then add competition and it gets even harder, of course.)

I'd wager OP will get some DMs from people willing to pay $1k+ for this sort of thing. Watch people can be very spendy, especially for something unique like this.