I wear my grandfathers Omega Army Issue watch. He received it in 1942 and as far as I am aware it has never been serviced and still keeps excellent time. It only needs wound every seven days and has a small dial on the face that counts from one to seven. When the dial marker hits seven a small window on the face clicks from wound to rewind and the watch will "ding" every hour on the hour on the seventh day if you don't rewind it! The watch survived the tropical swamps of Burma and the allied invasion of Sicily. The last service the watch saw was in Korea where in winter it was regularly -22*C below, and +40*C in the summer. What a watch and what a man it was that wore it! For trips were I intend to do a lot of snorkelling I wear my Seiko Automatic divers watch. I think a mechanical watch is an essential bit of kit for any outdoors man. If you find that your battery operated watch has failed in the cold (as most of them do) you will kick yourself. Most mechanical watches even the cheap ones, will last a couple of decades. Some like the Omega will outlive you! Quartz watches will at best if you buy a good one give you five years even if you change the battery every year, piezo crystals have a very limited life!