IWC Porsche design compass automatic wristwatch, ref. 3510 in black Pvd coated titanium, black dial, red center seconds, date, sapphire crystal, hinged case that allows the top portion to flip open by pressing the buttons on the side of the lugs revealing a compass and an emergency beacon mirror, on a cal. 375 21 jewel Eta cal. 2892 self wind movement, size 39 mm, thickness 14 mm, C - 1980s, working.