Indeed, it is the only watch to be, at the same time, a chronograph, a diver, a GMT, a pilot’s watch and a regatta watch. This Croton Chronomaster Aviator Sea Diver 9870 was introduced in 1969, and it was produced until 1978.Some speak of it as the quintessence of the 60’s Swiss chronograph. It includes a micrometer regulator, and the mechanism oscillates at a frequency of 18,000 vph (2.5Hz). It's constructed with 17 jewels, an Incabloc shock absorber device, a straight-line lever escapement, and a self-compensating Breguet flat balance spring. This Croton Chronomaster Aviator Sea Diver 9870 has a Valjoux caliber 23 mechanical manual-winding chronograph movement. It has a 45-hour power reserve at full wind, and the 14mm thick case, dial, and movement are all signed. There are twin recessed black subsidiary dials, including a running seconds register at 9 o'clock, and a 30-minute chronograph totalizer with a red 5-minute regatta countdown wedge. It has luminous broad arrow steel baton hands, and a center sweep chronograph seconds hand. There is a black dial with luminous baton hour indices around an outer minute/one-fifth second scale, twin luminous dots at 12 o'clock, and the perimeter has a tachymeter to 600 UPH. The 38.5mm diameter solid two-body case, downturned lugs, and bi-directional rotating flat bezel with a 60-minute dive scale with Arabic numeral hour markers every five minutes, are polished/brushed. SWISS." It has a black bi-directional 60-min bezel with 2 time zones. There are round chronograph push buttons with a screw-down winding crown, and a solid screw-down case back, inside of which is hand tooled a sunray pattern and engraved with "CROTON INTERNATIONAL WATCH CO. It has a shell cordovan strap with a stainless steel tang buckle, and a scratch resistant sapphire crystal. 1970's stainless steel Croton Chronomaster Aviator Sea Diver 9870. More about Vintage Chronomaster Aviator Sea Diver SS
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