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Last week at an antique fair I was struck by this Seiko 7223. After a first polish, buff and test I declared it the exact right amount of broken to pick up a new hobby.
The good news is that it runs. The bad news however, it loses about in a minute in 5, making it useless as a time keeping device,the alarm function also doesn't work and there's a mark on the day ring on the number 5. There's only one cure for it. Take it apart, service, and restore it.
This is the first watch I'll be setting my hands on, so this is likely to be a slow and heavily catalogued process, my method will be along the lines of:

1. Disassembly and part cataloguing
2. Polish the case, bezel and band back to original condition
3. Paint the text back on the bezel
4. Resurface the glass face
5. Clean and restore the movement and gear train
6. Rebuild and hope for the best

Now I've been told that because of what type the glass is it probably won't take a polish, but if the worst I do is not fix it then I'm exactly where I were. There's some diamond lapping paste on the way for that, and I might experiment with some other methods, maybe a clear lacquer resurfacing. At the end of it, if it also doesn't keep time we'll try a crystal replacement, if that doesn't work, we'll try to dial down to the component, and find a donor, or we may need to replace the entire movement.
We're also not going in blind, the watch repair community is alive and well, and catalogued for us the original technical manual. It's a bit of a dodgy scan, but it's better than nothing.
All my tools arrived today, so we're going to open it up tomorrow and see where I need to start.