Of course, I have to respond to this delightful cuckoo wristwatch meme…
I have not been able to find an actual working cuckoo wristwatch for sale. Various other chiming watches exist, but none that seem to have an actual cuckoo popping out.
There was photoshopped design of one on this site:
Another potential product was the focus of a failed Indiegogo campaign, but does not seem to have entered production: