IWC Ingenieur SL Automatic Stainless Steel IW3505-01

Genta's original SL, reference 1832, is the 38 mm watch known as the Jumbo (IW1832-01). The SL Automatic brings the name down to 34 mm, in a case 8.6 mm thick. The Ingenieur line itself goes back to 1955 and Reference 666, IWC's anti-magnetic watch with a soft-iron inner case.

Within the IW3505 references, the suffix sets the dial and the metal. In steel, IW3505-02, -03 and -04 have black, silver and champagne dials. IW3505-07, -08, -11 and -14 combine steel with yellow gold, and IW3505-11 is the two-tone twin of this white-dial watch. The SL Chronometer IW3521-01 is also a 34 mm steel watch with a white dial, at 8.8 mm thick, and the Ingenieur 500,000 A/m (IW3508-02) shares the 34 mm size with a black dial.