ORIS – Big Crown X1 Calculator

With its Big Crown collection, Oris demonstrates expertise in the field of tribute watches to historical aircraft. Inspired by the Bell X-1, the first plane to break the sound barrier, the Big Crown X1 Calculator refers to this era when flight plans were still made using slide rules, and accentuates this unique mechanism. Its rotating bezel serves to adjust the slide rule and to calculate fuel consumption for a given flight time, while the caseback displays a m/ft conversion table for international use. The chronograph push-pieces bear the X and 1, like a last nod to the date of the historical feat accomplished at 10:18 on October 14th 1947

Movement
Automatic, ETA Valjoux 7750

Functions
Hours, minutes, seconds, day, date, chronograph and slide rule

Case
PVD-coated gunmetal grey stainless steel, 46 mm
Sapphire crystal cambered on both sides with anti-glare treatment on both sides
Screw-in caseback with mineral crystal and m/ft scale
Rotating bezel with circular slide rule
Water-resistant to 30 m

Dial
Metallised black/grey
Superluminova-enhanced minute-circle, hour-markers and hands
12-hour, 30-minute and small seconds counters at 6, 12 and 9 o’clock respectively
Date window between 4 and 5 o’clock and day window at 9 o’clock

Strap
Black calfskin leather