Rolex | "Oversized" Air King Super Precision Ref. 5504The Rolex Air King Ref. 5504, introduced in the late 1950s, is a unique variant of the Air King line distinguished by its larger 36mm Oyster case, a size more commonly associated with the Explorer and Datejust of the same era. Produced in steel and offered with a range of simple, time only dials under the Air King and often Super Precision signatures, the 5504 preserved the clean, highly legible aesthetic that defined early Air King models while