Good automatic mechanical timepieces allow you to also manually wind the timepiece (although some cheaper models do not, so be aware of this). Unlike quartz, the power that is reserved is typically only enough for a few days, so if left unattended, the watch will need to reset and wound (this is why there are automatic watch winders). Power comes from a mainspring which is either wound by hand (the old-fashioned way) or automatically wound (self-winding) by a rotor that oscillates as your wrist moves, which in turn winds the mainspring. Mechanical watches are generally more expensive than quartz, and although they are not as accurate, most modern timepieces are very accurate (the best watches, some of which are officially certified chronometers, are accurate to 5+/- seconds per day, or better). In some cases the battery is rechargeable, in which case sunlight “solar-powered” (like a Citizen Eco-Drive) recharges it or wrist movement “rotor-powered” (hybrid like a Seiko Kinetic) recharges it (not to be confused with a rotor that winds the mainspring on a mechanical timepiece). They run on battery power, a long-life lithium battery lasts approximately 3-years. Quartz watches are generally inexpensive, easy to maintain, and highly accurate (typical accuracy is 15+/- seconds per month). One of the first things to consider when buying a quality timepiece is if you want a “quartz” or a “mechanical” watch. As the name suggests, this is a “Beginner’s Guide to Buying a Watch.” We designed this guide to help those readers that are new to watches, and need assistance in determining the basics of a watch so as to make an informed decision when buying one.
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