Croton, Stainless Steel 'Chronomaster Aviator Sea Diver' Wristwatch37.00 mm case diameter, black dial signed CROTON, luminous block numerals with outer tachymetre chapter ring, luminous steel baton hands with red center chronograph seconds hand, 30 minute subdial at 3 o'clock with red triangle 5-minute countdown, 60 seconds subdial at 9 o'clock, subdials with glossy black bezel, bidirectional turning bezel calibrated to 60 units, chronograph pushers at 2 and 4 o'clock, screw on case back, Valjoux 7733 17 jewel manual wind movement signed CROTON TIME CORP, later stainless steel matte link bracelet, adjustable fold over clasp.Inner case back stamp: CROTON TIME CORP SWISS.Case back stamp: WATER + SHOCKRESISTANT ALL STAINLESS STEEL SWISS MADE 953019 105 B 84227.