Why is a Japanese version of a watch twice the cost of the "international (?)" version? Thanks to responses to a question here, I understand that the GWX-5600 is the only solar atomic square with current time shown in stopwatch mode. Looking on Amazon and Ebay, I see the black Japanese version, GWX-5600-1JF, is around $200. The red GWX-5600C-4 and white C-7 versions are well under $100. Is there a substantive difference in quality or functionality, or is some other factor at play? $100 more seems a lot for a few cents worth of dye poured into a batch of resin. Thanks.