Explorer II 16570

Successor to the 16550, outwardly close to it but with the slimmer cal. 3185, a bezelBezelThe frame surrounding the crystal at the front of a watch. engraved in a thinner, rounder font, and black-outlined markers and hands on the white “Polar” dial. Lume went from tritiumTritiumA radioactive luminous-paint ingredient used on many vintage watches after radium. On RAF IWC Mark 11 replacement dials, an encircled T identified the tritium specification. to LuminovaLumiNova and Super-LumiNovaTrade names for luminous coatings that absorb light and release it in darkness. These non-radioactive materials differ from radium- and tritium-based lume. and then , changing the text at six. Black or white dial; 40 mm case about 12.2 mm thick.