The Ingenieur Chronograph (Ref. IW380801/IW380802/ IW380803) is driven by the new IWC-manufactured 69375 calibre with a bidirectional pawl-winding system and a power reserve of 46 hours. Two of the versions are available with a stainless-steel case and strap: one features a silver-plated dial and gold-plated hands (Ref. IW380801), while the other has a blue dial and rhodium-plated hands (Ref. IW380802). The stainless-steel strap has been newly developed especially for the Ingenieur. It is exceptionally comfortable to wear and has a fine-adjustment clasp integrated into the buckle. The third version comes in 18-caratred gold with a slate-coloured dial, gold-plated hands and a black alligator leather strap (Ref. IW380803). All the watches feature a see-through sapphire-glass back that provides a view of the 69375 calibre.