Demonstration Model A large, impressive, motorized demonstration model of the legendary Eterna...
Gehäuse
Metal, plexiglass.|Very good, worn.
Zifferblatt
|
Werk
Rotorwind movement.|Very good, capable of running, cleaning needed.
caliber:Eterna-Matic
circa:1955
country:Switzerland
originalbox:
originalcertificate:
guaranteecard:
servicecard:
extract:
accessories:
clasp:
An Eterna-Matic demonstration model (often called a store display or cutaway/transparent model) is a specialized vintage promotional piece created by Eterna to showcase their revolutionary ball-bearing rotor system. Introduced in 1948, the Eterna-Matic system used five tiny ball bearings to mount the oscillating rotor, drastically reducing friction and wear. To prove this mechanical breakthrough to retailers and customers, Eterna produced oversized scale models of the movement/rotor assembly or clear acrylic/glass-backed showcase watches allowing a clear view of the ball bearings in action. These counter displays and transparent demonstration models are exceedingly rare and highly sought after by vintage timepiece collectors today.
Gehäuse
Metal, plexiglass.|Very good, worn.
Zifferblatt
|
Werk
Rotorwind movement.|Very good, capable of running, cleaning needed.
caliber:Eterna-Matic
circa:1955
country:Switzerland
originalbox:
originalcertificate:
guaranteecard:
servicecard:
extract:
accessories:
clasp:
An Eterna-Matic demonstration model (often called a store display or cutaway/transparent model) is a specialized vintage promotional piece created by Eterna to showcase their revolutionary ball-bearing rotor system. Introduced in 1948, the Eterna-Matic system used five tiny ball bearings to mount the oscillating rotor, drastically reducing friction and wear. To prove this mechanical breakthrough to retailers and customers, Eterna produced oversized scale models of the movement/rotor assembly or clear acrylic/glass-backed showcase watches allowing a clear view of the ball bearings in action. These counter displays and transparent demonstration models are exceedingly rare and highly sought after by vintage timepiece collectors today.
