Omega Seamaster Aqua Terra 231.10.42.21.03.003 41.5 mm Blue Dial

Blue teak on a 41.5 mm steel Aqua Terra is 231.10.42.21.03.003. Omega started it in 2014: smooth bezel, stick and dot indexes, arrow hands, a 12.95 mm case, and a steel bracelet with a butterfly clasp. Domed sapphire treated on both sides, screw-down crown, 150 metres, and Co-Axial calibre 8500 showing through the back. Production has ended. This is the Aqua Terra people mean when they say teak and blue, not a diver with a rotating bezel.

Thirteen listings that ship to Saudi Arabia is enough for the last digit to drift. 231.10.42.21.03.004 is the neighbouring blue Aqua Terra from 2010, without teak named for that code. 231.10.42.21.03.001 belongs to the same 03. cluster. 231.10.42.21.06.001 is another 42 mm code in the family. Match teak, 41.5 mm, and 03.003 together.