The grey strap is made from structured rubber and includes grey lining and an additional stainless steel link which integrates it to the case. This certified chronometer is powered by the OMEGA Master Chronometer calibre 8900, certified at the industry’s highest standard by the Swiss Federal Institute of Metrology (METAS).Ladies Seamaster Aqua Terra automatic bracelet watch. Mother of pearl dial with diamond dot and a diamond bezel with date window at 6 o'clock. Screw down crown. Sapphire crystal with anti glare coating. Quick release double deployment clasp. Calibre 1424. 2 year international guarantee.