IWC, Ref. IW3711 Doppelchronograph Pilot, 18k Gold, Black Dial, circa 1990's Case: 42 mm, 18k yellow gold, two body, solid screw back, concave lugs, stepped bezel, push button at ten for the split seconds function, sapphire crystal, 2604678 Dial: black, golden Arabic numerals and minute marks, day and date apertures at three, luminous yellow gold batons, subsidiary dials for the seconds, thirty minute register and twelve hour register Movement: caliber 79230, gilt finish, automatic, 29 jewels, monometallic balance adjusted to five positions, shock absorber Band: leather, steel buckle Signed: IWC on the case, dial and movement This timepiece is accompanied by its service case, papers and guarantee card HID03101062020 © 2020 Heritage Auctions | All Rights Reserved