IWC REF. 3521 INGENIEUR PLATINUM ROTOR STEEL International Watch Co., Schaffhausen, "Ingenieur", Officially Certified Chronometer, Automatic, case No. 2603832, Ref. 3521. Made in the 1990s. Fine, tonneau-shaped, center seconds, self-winding, water ...
Ingenieur | Ref 3521 | Stainless Steel | Buy rare IWC watch – A COLLECTED MAN
IWC Ingenieur Ref 3521-2, Photo 1 on Gmtbroker
3521 IWC Ingenieur | The Hairspring
HODINKEE reviews the vintage ref. 3521 Ingenieur SL from IWC
IWC | REFERENCE 3521-002 INGENIEUR A STAINLESS STEEL AUTOMATIC WRISTWATCH WITH DATE AND BRACELET, CIRCA 1995 | Watches | 2020 | Sotheby's