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
KBH 7 Posted December 13, 2010 Miyota os10 or os20 chrono movement, made in Japan. Just the series of movements. Share this post Link to post Share on other sites
jcglobal 0 Posted December 15, 2010 Miyota os10 or os20 chrono movement, made in Japan. Just the series of movements. Understood, thank you. Share this post Link to post Share on other sites
