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The Grand Seiko SBGA231 Spring Drive Diver's watch is the BEST all around sport watch ever made. This is true because of the unique design of the Spring Drive movement that makes it more durable than a typical mechanical movement like those found in a Rolex or Omega. The Spring Drive is very accurate. Mine has gained about .5 seconds in 30 days. That's correct one half second! Unlike a typical quartz movement the Spring Drive does not have a battery or any other components that are likely to fail over time. It's estimated that a Spring Drive will run accurately for 35 to 50 years before any servicing is needed.
Learn more at: www.craigshipp.com/grandseiko