The Zodiac Hermetic Aerospace Jet (Reference 758) is a vintage 24-hour pilot's watch produced in the early 1970s. It is a "true" 24-hour timepiece, meaning the hour hand completes only one full rotation of the dial every 24 hours rather than the standard two.  Caliber 721

$825 Shipped
Additionally I have another donor watch if interested.  It is missing the caseback.