I wonder if anyone could give me some info on this watch. The only comparable models I have found are in solid gold. There are two reference numbers on the caseback: 151.025 and 153.029 and the movement is cal 671 24 jewels, adjusted to 2 positions.

 

Weird looks like a constellation with a Cal.672 and a Redial.
Maybe at one point the movement got changed.
From the great Constellation Blog Database.

Here another Link https://omegaforums.net/threads/omega-constellation-chronometer.3718/

Search Omega Cal.672 and you find your Watch.

 

Many thanks!