Due to slightly similar names, a battle played out in between Movado, already well established in the US at the time, and Nivada, resulting in Croton stepping in as the US distributor of Nivada-made watches. For much of its history, Nivada stuck to European markets until an expansion attempt into the American sector in the 1940s. Nivada (of) Grenchen dates back to 1879 in the small Swiss town of, well, Grenchen. This Croton Chronomaster Aviator Sea Diver 9870 was introduced in 1969, and it was produced until 1978.Why This Watch Matters The red 'lollipop' seconds hand is just enough to take this Chronomaster to the next level. 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. 248/Valjoux 7733 mechanical manual-winding chronograph movement. This Croton Chronomaster Aviator Sea Diver 9870 has a Landeron cal. 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 white 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 steel baton hands with luminous inserts, and a red center sweep chronograph seconds hand. There is a black dial with luminous baton hour indices around an outer minute/one-fifth second scale, a red marker 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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