3073. 3073Y IWC. A stainless steel automatic calendar wristwatch with 8 days power reserve IWC. Stainless steel wristwatch with date automatic movement and 8-day power reserve Model: Big Pilot Reference: IW500401 Date: Circa 2010 Movement: Jewelled automatic, 8 days power reserve Dial: Black, white Arabic numeral hour markers, luminous baton quarters, white outer minute divisions, date aperture at 6, power reserve indication at 3, black dagger hands with luminous inserts, white centre seconds Case: Brushed and polished tonneau form, screw down back and crown, No.3298247 Strap/Bracelet: IWC black alligator leather Buckle/Clasp: Signed steel folding clasp Signed: Case, dial & movement Size: 46mm