I suspect this would have been the watch that Herbie Hancock wore when he made his famous “Rockit” video. Back in the early 1980’s, Seiko was trying to put everything from TV’s to radio’s into watches, and along with those ill advised choices, they also made the drum machine watch. Ugly and over priced, the watch never caught on with the public.
Now, to be fair, the technology was pretty advanced. You’ve got a little drum machine with a built in speaker, six drum patterns, and a metronome mode. It could even tell the time and had a built in alarm!
We never saw them in the US, but you can find them on Ebay now. Just expect to spend some serious cash for a bit of nostalgia.