Completely false - there are several models in solid 18k gold that came with the blue insert in the bezel (some were gold, and some even gemstones), and there were models that came on straps.
For example Ref. 21988000 is 18k gold with blue bezel insert and gold bracelet, and Ref. 26988003 is the same watch on a blue croc strap.
I haven't been able to find one with gold sub-dials, but Omega made so many variations of these models it would not surprise me at all that one existed. Right now I would lean towards the watch being legit.
Cheers, Al
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