$1375 is a hopeful number where the seller hopes that someone will fall in love because of the condition. Keep in mind that the main reason people are interested in this watch is because it is in unworn condition. If you buy it and wear it, it will quickly lose the thing that makes it interesting and it becomes just another gold-capped Omega.
This watch is really not for me. But if I liked it, I would grab it at $600. If I really, really loved it, and was absolutely sure I would keep it for the rest of my life and never sell it, I might stretch as high as $1000, recognizing that I'd be likely to lose money if I chose to sell it.