IWC DER FLIEGER CHRONOGRAPH REF. 3706 STEEL Very fine, self-winding, stainless steel wristwatch with chronograph and day & date. | Important Modern & Vintage Timepieces | Hong Kong, April 21st, 2018 IWC DER FLIEGER CHRONOGRAPH REF. 3706 STEEL Very fine, self-winding, stainless steel wristwatch with chronograph and day & date.