In 2009, IWC launched the Big Ingenieur Chronograph model in stainless steel, rose gold and platinum versions. Now the Swiss watch manufacture presents two new stainless steel variants of this large-sized Ingenieur watch.

The reference IW378405 features a silver-plated dial with luminescence and black alligator leather strap. The IWC Big Ingenieur Chronograph IW378406 model has a black dial and matching color alligator leather strap.

The massive stainless steel case of Big Ingenieur Chronograph measures a diameter of 45.7 mm and thickness of 14.7 mm.

Equipped with in-house IWC 89361 Calibre, the watch displays hours, minutes, seconds and the date. This 40 jewel automatic movement also offers chronograph function with flyback mechanism. Moreover, it offers a power reserve of approximately 68 hours.

The strap width is 29mm. The IWC Big Ingenieur Chronograph is water resistant up to 120 meters.

Technical details

Model: IWC Big Ingenieur Chronograph

Versions
Reference IW378405: Stainless steel case, silver-plated dial with luminescence and black alligator leather strap
Reference IW378406: Stainless steel case, black dial and black alligator leather strap

Case
Stainless steel case
Case height 14.7 mm
Diameter 45.7 mm
Screw-in crown
Sapphire glass, flat, antireflective coating on both sides
See-through sapphire-glass back
Water-resistance: 12 bar

Movement
IWC 89361 Calibre
Mechanical chronograph movement
Self-winding
68-hour power reserve when fully wound
Stopwatch function with hours, minutes and seconds
Hour and minute counters combined in a single totalizer at 12 o’clock
Flyback function
Date display with crown-activated rapid advance
Small hacking seconds

Strap
Alligator leather strap