I believe Seiko stopped using gold plating quite a while back and switched to titanium nitride. It has the benefits of adhering better to stainless, and is actually harder than the stainless underneath.
I saw one of these in person when I was in Thailand a few weeks ago, and while it isn't my style, it is a really beautiful and well finished watch.
I have had at least a dozen gold tone Seikos through the years, including one that was my daily watch for a dozen+ years, and a couple of others from the early 80s that are still fine. I can't remember a single one having any problem. I recognize that is a small sample size compared to the number of Seikos made, but does indicate to me good probability of success.