PRESTO

Pendulum rod made of Invar, a metal alloy with a very low thermal expansion coefficient, with compensation tube for temperature variation.
Stainless steel arbor, revolution on 15 ball bearings.
24K gold-plated gears and pinions.
Crystal glass structure, 1/2”-thick discs.
Charge autonomy: 7+1 days / Charge reserve: up to 5 minutes
Suspension spring.

Designed for indoor use