Canuck
路RePlateit could probably do it. The owner should take note of the link I included, and send RePlateit a picture. That would put an end to all this conjecture.
You say that like "conjecture" is a bad thing. 馃槈
https://www.merriam-webster.com/dictionary/conjecture
Do you have a better word to describe all the guesswork that has arisen relative to a solution to the pitting? The opinion of a service that could likely do the repair might be worth many opinions from those who can鈥檛! Think about it!
RePlateit is who you want to talk to. They were inQuebec (Canada), but have recently moved. They are now in Roseville, California. I can vouch for the quality of their work. See images, before, and after. Maybe send them a picture of what you want fixed.
https://www.replateit.com/
Best would be to mill-cut (I hope this is the right expression? = grind it out completely) the corroded material until you reach "healthy ground" and have the gap laser-welded - then you can have an aesthetical solution and ease of mind.
New case? For a dial and hands so attractive, it would be worth it in my opinion.
The fact that the case is so damaged would mean I would have no qualms about swapping it out. You would be left with a unoriginal but still fantastic looking vintage watch.
Best would be to mill-cut (I hope this is the right expression? = grind it out completely) the corroded material until you reach "healthy ground" and have the gap laser-welded - then you can have an aesthetical solution and ease of mind.
Really this is the only solution. This isn't a plated case to begin with, so sending it to a place that specializes in replating base metal cases is not likely going to be helpful.
The only other option is to thoroughly clean it, and live with it as is.