Ianos AvyssosvsSinn U18

The Ianos Avyssos is recognized for its historically inspired, unconventional dive watch design, featuring a sandwich dial with lume visible through cut-out markers and a small seconds disc referencing the Antikythera mechanism. Reviewers and owners highlight its unique dial with a blue-to-black dégradé effect and hour markers shaped like Greek sponge diver ballast stones. The 44mm angular case with a PVD finish and steel bezel with blue markers is noted, as is the inclusion of a NATO strap alongside the primary strap. One owner acquired the watch as a grail, appreciating its steel bezel. A manual-wind movement, specifically the ETA 7001, is present, which allows for a slim case but is considered an unusual choice for a dive watch by one reviewer. This reviewer also flags a disconcerting ratcheting click when tightening the crown. One forum user questioned the durability of the watch's strap for diving.

The Sinn U18 is praised for its unique deep blue/green dial with three-dimensional oxygen bubbles that change with light, and its comfortable, easily adjustable bracelet. Owners find the watch stunning and a piece of history, appreciating the refined hands. The Sinn U18 features a 44mm, 15.5mm thick case made from German submarine steel, offering a 2000-meter dive specification and Sinn's Ar-Dehumidifying technology, powered by a Sellita SW300-1 movement. The case thickness is apparent, and the watch comes as a complete set with box and papers for $3,000-$3,680. On balance, owners and reviewers rate the Sinn U18 highly for its striking dial and robust build.