Ever since my favorite watch maker in Santa Cruz/Monterey area retired, I have been bringing my watches to World Time in San Jose. They're just down the road from Valley Fair Mall. Son, the proprietor is super friendly and knowledgeable. He's worked on my 1920/1930s era Gruen Quadron, my Rado Original Diastar, and right now has a 1960s Constellation of mine. He's certified by Omega and definitely has access to original parts from Swatch Group and Omega.
I highly recommend them-- they listen to instructions, especially if you say you want to keep things period correct. They will not polish your watch if you don't want them to, and their pricing is very reasonable.
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