Membrane Case Genta rarer than the Dubail but

rarer than the Dubail but comparably dark in hue

The 37mm ref

from the first generation of the model

5066A Aquanaut made in 500 examples for the Japanese market in 1998

A386 El Primero

Membrane Case Genta rarer than the Dubail butHairspring's Swiss made membrane watch case is an uncompromising storage and transport solution for all levels of watch collectors. This case is designed to protect the most delicate timepieces. Utilizing a high tension polyurethane membrane, the watch sits in a suspended environment which eliminates the risk of shock, impact, or humidity changes. They are stackable with interlocking feet as a way to store a collection long term and safely.