Omega Seamaster Aqua Terra 231.10.42.21.03.004 41.5 mm Blue Dial

Steel and a blue dial are what 231.10.42.21.03.004 actually gives you. This discontinued Aqua Terra 150M, dated from 2010, wears a 41.5 mm case that sellers often round to 42 mm. It is the mid-size Seamaster that looks like an Aqua Terra and stops short of a dive bezel. Movement and bracelet are not confirmed for this reference, so the 03.004 ending is the identity.

Fifteen listings that ship to Saudi Arabia make comparison easy and mix-ups cheaper. 231.10.42.21.03.003 is one digit away: the blue teak Aqua Terra with Co-Axial calibre 8500. 231.10.42.21.03.001 sits in the same cluster. 231.10.42.21.06.001 is another 42 mm Aqua Terra with still less confirmed about it. If the last three digits move, so does the watch.