Nicely aged 16570 Explorer II from 1991. The dial has great patina on the lume and the hands are lighter which is pretty common among this reference - the dial surface also has some aging throughout which is hard to capture with photos   The Case is sharp and probably was lightly polished in the past.  The bezel is also sharp with 99% of the paint in tach.  The bracelet is oyster style with 11 links and no stretch.  The movement is running strong and keeping excellent time however last service is unknown.  Certainly a watch that has recently become much more notable and a great daily wearer.