IWC Ingenieur
220 references in this family, taking 18, 20, 21, 22 mm bands. Check yours before you buy.
IWC Ingenieur, page 3
- Ingenieur Double Chronograph Titanium / SilverIW3865-01
18 mm - Ingenieur Double Chronograph Titanium / BlackIW3865-03
18 mm - Ingenieur Midsize SilverIW4515-01
20 mm - Ingenieur Midsize Silver StrapIW4515-02
21 mm - Ingenieur Midsize Gold IndexIW4515-03
20 mm - Ingenieur Midsize Gold Index StrapIW4515-04
18 mm - Ingenieur Midsize Rose Gold / Silver / StrapIW4515-05
18 mm - Big Ingenieur Black / AlligatorIW5005-01
21 mm - Big Ingenieur PlatinumIW5005-02
20 mm - Big Ingenieur GoldIW5005-03
20 mm - Big Ingenieur BlackIW5005-05
22 mm - Ingenieur Constant-Force Tourbillon Platinum / CeramicIW5900-01
22 mm - Ingenieur Constant-Force Tourbillon Red Gold / CeramicIW5900-02
22 mm - Ingenieur SL Perpetual Calendar / EnglishIW9245-03
integrated - Ingenieur Mecaquartz Chronograph Alarm Yellow Gold / Black / BraceletIW9515-01
integrated - Ingenieur Mecaquartz Chronograph Alarm Yellow Gold / White / BraceletIW9515-02
20 mm - Ingenieur Mecaquartz Chronograph Alarm Yellow Gold / Champagne / BraceletIW9515-03
20 mm - Ingenieur Mecaquartz Chronograph Alarm White Gold / Black / BraceletIW9515-04
18 mm - Ingenieur SL Quartz GoldIW9701
20 mm - Ingenieur SL Quartz Gold / RomanIW9701 Roman
18 mm
Other IWC families
Inside each one the lug width often changes: it is the reference that decides.