I'm not seeing that many examples for sale. A steel only model has sold on
this forum back in 2018 for $875, which can serve as a reference. A two-tone like yours, but quite polished, is selling on eBay for $1,455. Realistically, I would imagine yours being in the $1,000 - 1,2000 range.
It's best to do your own homework, for this watch and future watches, as you can also learn in the process. Using the reference, you can search for "omega 168.045" and find two-tone watches like yours for sale in eBay, Chrono24, forums, etc. Check also completed listings in eBay to get an idea what prices were actually sold, not just what's being asked. Keep in mind that eBay and C24 prices are often inflated, both because of high fees, but also the sellers trying to squeeze every penny out of watches. Prices in forums are usually more realistic.