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OP, does the bracelet have any markings? It doesn't seem original to the watch, but (may be glare or color correction) it also looks like white gold. That would be a good indication that the case is also white gold. Gorgeous watch regardless. Watch out who you take it to for servicing and if you choose to sell it, take it to somebody knowledgeable in vintage watches.
Yeah regarding the bracelet I am unsure if it's the factory fitted one or changed at the dealership as there are no Omega logos on the same. There are some markings which I feel are hallmarks but I am not sure. Will upload additional clear pics for the case and bracelet.
The case, however is definitely not white gold.