Steel IWC Big Ingenieur IW5005-01. Case diameter 45.5mm,  water resistant to 120 meters, with sapphire crystal see through case back, steel bezel.
IWC caliber 5113 movement, 42-jewels with 7-day power reserve.
Black dial with textured centre, applied luminous baton hour markers and Arabic 12, power reserve indicator at the 3-position with date display at 6, outer white minute markers. Croc leather strap. Box and papers. Our reference S12858.