Croton Nivada Grenchen Chronograph Diamond Opal is unpredictable by nature

Opal is unpredictable by nature

Movement is running very well after passing by our test bench

Piaget’s ultra-thin movements and masterful design language are on full display here

The dial developed an even patina color and slight discoloring throughout as seen in the photos

Croton Nivada Grenchen Chronograph Diamond Opal is unpredictable by natureHere's a vintage Croton Chronomaster Aviator Sea Diver chronograph manual wind with a matte black dial from the late 60s, early 70s. Keeps great time and is fully functional. Measurements include a 38mm case size and 20mm lug width. It's on a brown vintage style leather strap. Valjoux movement (2 register) Features include the 30 minute counter at 3 a clock and the bi directional rotating black bezel. Black dial with red and blue instrumentation at 3