There can be many thing that can cause a quartz watch to run slow. The most common cause would be an old battery.
It could be to make the watch run for a longer time than if it only had 1 battery.
Most Omega watches come with 21 jewel motion or higher- they generally don't run on batteries, being 'automatic' - they run on kinetic motion. Those that do run on battery generally have a 9 to 12 month battery life.
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The japan movement watch does require a battery. The battery in the watch will need changed frequently to keep the watch working properly.
An automatic watch winder is a watch that automatically winds itself to have power by the movement of your arm. When your arm moves the watch automatically winds itself giving it power so it does not need to run on a battery.
The most important part of a watch is battery. With out a battery a watch is dead.
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Skeleton watches are unique in that one can see the inner workings of the watch that are usually hidden behind the face of the watch. One can see the balance wheel and mainspring behind the hands of the watch.
These tips will help you properly maintain your watch and battery regardless of which battery type your particular watch uses. Life expectancy of a watch battery varies from 18 months to 5 years. It is wise to establish a habit of replacing your watch battery every two years. Dead batteries can leak and damage your watch. Purchase a replacement battery only, when you are ready to use it.
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Try a battery tester