Price guide / help please

First, you may wish to be careful, that seller(or at least source of the pics) you're looking at isn't the original? Looks like this is the original seller: https://asiatimepiece.com/products/omega-constellation-18k-gold-chronometer-automatic-vintage-watch

Second: You're right, that one is well worn. I can't tell if it is compression artifacts or something wrong, but the 'chronometer' and 'certified' text look mildly suspicious. I lean towards the former, but worth making sure this isn't a redial/repaint.

Finally: The solid-goldness of it probably makes this worth quite a bit because of the gold value. BUT the watch itself is probably not a very good one to wear unless you're looking for a ladies watch. That 24mm width is TINY. IMO, it is an attractive watch, and someone might enjoy wearing it, but you'd need to have a pretty small wrist to pull it off. As far as the price itself, ~$2700 seems about 2x what it is worth, unless it has a heck of a lot more gold in it than I'd expect.

It's not really a particularly desirable model, as far as I can tell, so realistically the value is dominated by the gold melt value. The seller will be waiting a long time with that asking price. When I see crazy asking prices, I generally just move on, because it suggests that the seller is not realistic.