This is a rare 38mm jumbo waterproof model from the late 1940s by International Watch Company (IWC), featuring the renowned Caliber 83 movement and the highly sought-after "Hermet" case with a silver luminous dial. Among the airtight snap-back waterproof cases known as "Hermet," this piece stands out as the largest, measuring 38mm—an exceptionally rare find.
Its distinctive case design, reminiscent of a crown guard, combined with its oversized dimensions, sets it apart from the more common 30mm vintage IWC models, giving it an overwhelming presence. It is powered by the legendary small seconds movement, Caliber 83, which is one of IWC’s signature mechanisms. The well-balanced aesthetics of the small seconds layout within the jumbo case, along with the beautifully aged silver luminous dial, give this watch an outstanding vintage appeal.