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Were they selling it as genuine Omega?
Looks fine, just refinished.
Bracelet looks genuine. It is a very nice bracelet and I use to wear it with 540 Endlinks on my FOIS.
Your 1098 with 526 end links fits references 166.0036, 166.0026, 165.0026 and maybe some other watches.
Important for sizing: The removable links have springbars, so do not try to push them out.
That is the same as for the 1116 bracelet and here are some tipps for that:
https://omegaforums.net/threads/sizing-a-1116-bracelet.78049/
https://omegaforums.net/threads/how-to-remove-links-on-a-1116-bracelet.56610/