Omega Seamaster Aqua Terra 231.10.39.21.01.001 39 mm Black Dial

What 231.10.39.21.01.001 gives you is a 39 mm Seamaster Aqua Terra 150M whose production has ended. That diameter is what sets it apart from the larger steel Aqua Terras in the same family. Dial, bracelet and movement are not confirmed for this reference, so the code is the identity.

Those seven Saudi listings only help if the 39 mm case and 231.10.39.21.01.001 both match. Do not fold it into the current 38 mm 220.10.38.20.01.001, or into the 231.10.42 cluster nearby. A listing that only says Aqua Terra 150M is not enough.