[Shuie]

FWIW, chronometer spec is between -4 and +6 sec/day. I've owned three Rolex that were +/- 1 sec/day; Ref. 1575 GMT, a 11660 Seadweller, and a 116520 Daytona. My 114270 Explorer is chronometer rated and was +6 sec/day the last time I checked.