Just purchased this gem...never even knew of them, a Timex Dynabeat 1975 ish absolutely lovely fumè dial...looks like a 1960s dive watch.For info purposes , thd 1st day on thd wrist it lost 15 seconds and today 12 hours on the wrjsf and 12 hours off its lost about 2 seconds...hacking function as well..im going to get a few more..some dont have the date window, which makes them lookeven better with a bluish fumè dial..and a tigers eye one which isverv attractive.