The 16613 is a two-tone version of the famous Submariner. It was available with both blue dial and bezel and a black dial and bezel. Up to approx. '98 tritium was used on the dials ('Swiss-T<25'), after which Luminova ('Swiss') and Superluminova ('Swiss Made') were used to light up the hands and indexes.The version pictured has an exceedingly rare black Onyx dial.
