The 167.005 (no date) and 168.005 (with date) are considered the "iconic" case styles that collector picture when saying the words "pie-pan Omega Constellation".
However, there are many other case references that have the 12-sided dials, starting with the Ref 2852 from the late 1950's through the current Globemaster models. The model you are looking at (168.025) is about mid-pack in desirability.
When you look at these, you want to make sure that the engraving on the back is nice and sharp.
BTW, I implore you not to buy this particular watch. You will need to find a whole new case. To my knowledge, Omega never made replacement medallions for Constellations, only new case backs or cases.
I've seen these front loaders go for $700 to $900 in perfect condition. More if in exceptional condition. However, this watch without the medallion is far from that.
Hope this helps,
gatorcpa
Click to expand...