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I second what Darren is saying, here. I am a watchmaker and I see watches all too often that basically self destruct because they have never been serviced, or suddenly start getting wound after many years in a drawer. It took me all of three months to destroy a NOS dive watch I got at a flea market, before I went to watchmaking school. Fortunately I was able to rebuild the watch, but lesson learned. Watches need servicing every 4-7 years, depending on type and use. A proper service is fully disassembling the watch, cleaning it in approved solutions (no ultrasonic, it strips the plates) and lubrication with industry standard lubricants, and regulating after demagnetizing. I see a lot of watches that are merely 'dipped', and then dried out. This is actually worse than no service at all.