Serial number: 55180539
Article ref: 35218000
The watch should have a blue dial, so this one may be faded - I've seen blue dials from other companies (Oris for example) fade to a copper colour like this over time, so I suspect that it what happened here. Personally I don't mind the look of it.
Note that the movement shot is not of this watch - it shows a Speedmaster reduced movement, and your watch has an ETA 7751 based Omega Cal. 1151, not the 1143 shown. You can see the crown on that shot is different than the one on the rest. The 8 sided crown on the other photos is the correct one for this reference.
The 1151 is a solid movement, but if the seller didn't have proof of a recent service (not just their word, but proof in the form of a receipt from a known good service provider) you should consider getting it looked at sooner rather than later.
Cheers, Al
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