Croton Chronomaster Aviator Sea Diver ref. 9870 (Valjoux 23)

Brand: Croton Model: Chronomaster Aviator Sea Diver Chronograph ref. 9870 (Valjoux 23 movement); case #105-27627; Swiss Made circa 1960s Case: Solid stainless steel case with screw-down back is approximately 38mm excluding the original unsigned winding crown Strap: 20mm handmade smooth calfskin strap with contrast stitching and 16mm polished stainless steel tang buckle Movement: Valjoux cal. 23 manual-winding chronograph movement (17 jewels) with column-wheel activation; 18,000 BPH; Swiss Made; serviced Features: Stunning original matte black dial with beveled shiny black sub-register rings and gorgeous yellow Tritium hour markers; outer tachymetre scale for calculating the average speed of a moving object over time (i.e. for racing applications); 30-minute chronograph recording capability and red 5-minute yachting regatta countdown; cool original broad-arrow hour hand; original "alpha" sub-register hands; original rotating bezel displays elapsed time (i.e. during dives) and can track