This timepiece is a magnificent artifact from March 1965, as confirmed by the serial number 5035926. The Auto Dater series is defined by its ultra-sophisticated "Jet" movement, which utilizes a unique circular geared rotor instead of a traditional oscillating weight, allowing for a remarkably slim and balanced profile. It is powered by the 17-jewel Caliber 1120, a mechanical marvel engineered to provide a whisper-quiet winding action and a sweeping second hand that glides with effortless grace across the dial.

The architecture is quintessentially mid-60s luxury, utilizing a polished stainless steel case with sharp, tapered lugs and a breathtaking silver sunray dial that features a distinctive "cyclops" date magnifier at 3 o'clock. The dial is a work of high-end JDM art, featuring hand-applied faceted indices and the proud "Auto Dater" script, which signaled the height of modern convenience for the 1960s businessman. Flipping the watch over reveals the crisp caseback engraving with the Parawater star logo, definitively confirming its authentic Japanese Domestic Market (JDM) heritage. This is an essential acquisition for an elite collector who appreciates revolutionary movement design, the mechanical soul of a Jet Rotor heart, and the timeless, shimmering presence of a vintage Citizen.