FOR NAUTICA BANDS OPEN THIS LINK:
http://www.ebay.com/sch/bluss_929/m.html?item=221597748969&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562
Nearly always, Nautica watches have a screw-down caseback. This is best opened using a case tool that provides at least three points for rotation of the caseback. Look up watch case back tool on amazon. Avoid the tools that have only two points.
ALL NAUTICA WATCH BAND OPEN THIS LINK IN EBAY
http://www.ebay.com/sch/bluss_929/m.html?item=321576294387&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562