As far as I know, Grand Seiko (GS) watches are typically sent back to Japan for servicing and maintenance. This is because GS movements are proprietary—unlike mass-market movements that are widely available, they must be sourced directly from the manufacturer. Consequently, many GS owners worry about this aspect. Honestly, though, GS watches are high-quality timepieces; under normal, proper use, they rarely suffer damage. Even if an issue does arise, it isn't a major problem—you can simply send the watch back to Japan for repair. As for routine maintenance, experienced independent watchmakers can handle the job; the process largely involves disassembly, cleaning, and lubrication, which is much the same as servicing any other mechanical watch.
