Bulova BVA-SERIES 100 User Manual
Page 7
YOUR NEW WATCH IS A MECHANICAL WATCH (NO BATTERY)
Mechanical watches differ from Quartz watches in several respects:
1. No battery changes are needed - they are powered by a mainspring, which is wound either
by wrist movement; or, in some models, by daily winding of the setting crown.
2. Because it is a mechanical device, its accuracy is subject to the effects of gravity and
temperature. You can expect, on the average, a daily variance of up to 10 to 20 seconds for
mechanical watches.
3. With over 100 working parts, cleaning and lubrication are recommended every three to five
years for optimum accuracy and long-term efficiency.
THE AUTOMATIC SELF-WINDING MECHANICAL WATCH
The Automatic mechanical watch is self-winding once it is running. To start the watch, it must
be wound at least six or seven times before you wear it. After that, your daily activity should
wind the watch sufficiently to keep it running at night when it is not worn. If normal daily activity
is not sufficient to wind the watch automatically, manual winding may be necessary.
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