Hublot Big Bang Aero Bang Ref 311.Sx.1170.Gr a stainless steel skeletonised chronograph wristwatch with date circa 2017. Dial: black, semi-skeletonised. Calibre: cal. 4214, HUB4200 automatic, 27 jewels. Case: brushed stainless steel, sapphire crystal display back secured by 6 screws. Case number: 1141507. Closure: Hublot rubber strap and stainless steel folding clasp. Dimensions: 44 mm. Signed: case, dial and movement. Accessories: Hublot international warranty dated 20/04/2017 and presentation box.