The case looks great, with a slightly bent lug, but overall very few usage marks and no scratch. The very rare brown bezel is looking great. This chronograph is going hotter and hotter, especially since the publication of the excellent book “Chronomaster Only” by Grégoire Rossier and Anthony Marquié.įeaturing a beautiful and particularly well designed black dial with dashes of red, broad arrow hands, black bezel, round pushers, this is a very desirable and typical 60s chronograph. 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. There is a tachymeter around the circumference of the dial and a minute and seconds track around the circumference of the dial.Some speak of it as the quintessence of the 60’s Swiss chronograph. The subdials are painted white with running seconds at 9 o’clock, chronograph minutes at 3 and chronograph hours at 6 o’clock. The sub dial hands are all painted black. The Hour, Minute and Chronograph Seconds hands are all silver in color and have luminous compound. The dial is matte black in color with silver hour marker inserts. This is a very cool, large piece which comes with an interesting story, making it perfect for many collectors.

The watch has been fitted with a brand new heavy stitch Hirsch strap. The watch is in fair condition with its original screw down crown and rotating bezel.

Of course we can come up with any story to suit our own narrative but we have since found multiple models with the same ghosted Croton front behind the Rotary logo making this certainly not a one off. We think that Rotary had a few pieces, removed just the Croton logo and applied theirs making the watch quite unique. When we looked closer at the rotary logo we noticed some ghost font that starts with a “C” and ends with a “N”, Croton? we think so. What makes this watch so interesting, and somewhat mysterious, is that this watch model is from Croton (Nivada Grenchen) and we have not seen a partnership from them before.

The watch is housing a manual wind Valjoux Cal 7736 Chronograph movement. This is an interesting, large Rotary Croton Diver-Chronograph that back in the day was water resistant to 200m.

Download croton sea diver watch