The Longines Spirit Flyback Prototype is a 42 mm watch from the Spirit Flyback collection. Its stainless steel case is 17 mm thick and 49.5 mm from lug to lug, with 22 mm lugs. It is water resistant to 100 m. The crystal is sapphire.

The manufacturer’s list price is US$7,400. It comes in 2 versions, with black, green and brown dials.