IWC Schaffhausen Big Ingenieur Chronograph New Steel Models IW378405 and IW378406

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.

IWC Big Ingenieur Chronograph Reference IW378405
IWC Big Ingenieur Chronograph Reference IW378405

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.

IWC Big Ingenieur Chronograph Reference IW378406
IWC Big Ingenieur Chronograph Reference IW378406

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