jcglobal 0 Posted December 13, 2010 What does the "OS" stand for in the terminology "Japanese OS Chronograph"? Is it a manufacturer's name or something else? Thanks. Share this post Link to post Share on other sites
pollux1 3 Posted December 13, 2010 Most likely the watch in question is using the Miyota OS20 movement, hope this helps. Share this post Link to post Share on other sites
mspangl 0 Posted December 13, 2010 its a quartz movement chronograph no smooth sweeping hands Share this post Link to post Share on other sites
