The "worst" watch I've ever come across was found on a beach on the Pacific coast. All that was left was the dial and I could tell from the markers that it was from a Norman.
I recently came across a contender. It also took a swim in the Pacific about 30 years ago. The owner kept the watch but never had it addressed. That is, until recently when he sent it to me to see if I could salvage it.
The model is a 1955 K-402. It was made through 1957,