That's really interesting. Obviously yours to do with as you wish but I want to share that my initial reaction was that you might want to consider leaving it as is.Then she said "He was wearing it when he died". mg:
As he died in a glider accident, resulting in a fall of 300 feet, I wondered what sort of state it was in. Although the battery has since died, it was apparently unscathed. Testament to the ruggedness of a good old worth diddly Seiko ! Update when I've cleaned it up and got a new battery for it.
That watch is more than a watch, like the kind that come and go in our collections, that's a watch with a story. And the story is "most true" in the state it is in.
Still, it's just a material object so I don't want to overstate it. I could see replacing the battery and even wearing it. Not sure how much cleaning up I would do; certainly not a restoration in my mind.
Thanks for sharing.