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. Nevada also adopted other modern wristwatch innovations, creating waterproof and “rustless” watches that would stand up to the rigors of the outdoor adventures they were made for.More about Vintage Chronomaster Aviator Sea Diver SS Nivada Grenchen or “Croton” in the States was founded in Grenchen, Switzerland in the 1920s by Jacob Schneider, Nivada Grenchen was actually one of the first watch brands to manufacture automatic watches. This design mentality naturally attracted adventure seekers and professionals alike. The 1960s and 1970s are what we know now as the golden era of tool/sports watches, where the form of a watch was designed specifically for an intended application or purpose. Within the vintage watch community, tool watches hold a significant place in the hearts of many collectors. The Chronomaster Aviator Sea Diver from Nivada Grenchen and Croton were produced when adventures and exploration were at the forefront of what was happening worldwide and within the pop culture of the 1960s.

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