The Chronomaster Aviator Sea Diver is Nivada Grenchen’s re-edition of its 1960s chronograph, relaunched in 2020 after the revived brand reacquired the name. It has a 38 mm stainless steel case, about 13.75 mm thick, with a rotating dive-style bezel, a Sellita SW510 chronograph movement (automatic or hand-wound versions, around 48 hours of power reserve) and a range of dial executions, including panda, “lollipop”, “broad arrow” and tropical sub-dial variants. Pricing started at around 650 CHF at launch and now sits roughly between $1,800 and $2,500 depending on version and bracelet.

The original Chronomaster was a mid-century Swiss tool chronograph combining pilot-style legibility with a diver’s rotating bezel, hence the “Aviator Sea Diver” name. Nivada kept the proportions and dial layouts faithful to the vintage reference while swapping in modern manufacturing and a current Swiss movement in place of the Valjoux, Landeron or Venus calibres of the period.

The watch community received it well: reviewers such as Monochrome, Gear Patrol and Watchclicker described it as a faithful reissue with real value for a Swiss-made mechanical chronograph, and report no significant quality issues. The first 2021 automatic and hand-wound batches sold out quickly, and it is regarded as the model that put the revived Nivada Grenchen on the map. It remains in production, with new dial and strap variants released regularly. Figures come from public reviews and retailer listings and vary by reference; check Nivada’s site for current specifications.