IWC Ingenieur SL Midsize Skinny, ref. 3506 - Switzerland, c. 1989 - Automatic[...] | lot 140 | Montres Vintage at Auctionata Paddle8 AG | Auction.fr | English
IWC Ingenieur 3506 | Rarebirds
IWC Ingenieur SL Automatic – Analog:Shift
WTS: IWC Ingenieur 3506 Full Kit | WatchUSeek Watch Forums
Dark 'Graph Paper' 3506 IWC Ingenieur SL | The Hairspring
Loupe This: 34mm Genta IWC Ingenieur SL hotness for the wrist
IWC Ingenieur 3506 | Rarebirds
IWC Ingenieur SL Automatic Steel Ref. 3506
WTS: IWC Ingenieur 3506 Full Kit | WatchUSeek Watch Forums
The IWC Ingenieur - Dial Variations in Vintage Models: Part 4
IWC Ingenieur SL in acciaio Ref. 3506. - Gioielli Pellegrini
IWC INGENIEUR REF 3506 STEEL International Watch Co., Schaffhausen, " Ingenieur Automatic'', case No. 2388290, Ref. 3506. Made circa 1988. Fine and very rare, tonneau-shaped, center-seconds, self- winding, water-resistant, antimagnetic, stainless steel ...