You didn’t post a link to the eBay posting or give any indication of the BIN price or bidding. If you had we could have commented on it and given you an idea as to whether it’s overpriced (very likely) or underpriced. I can tell I wouldn’t go for it if you offered to buy it for me!r
Whether it’s on OF Private Sales or eBay, and it will depend on your personal preferences, you can probably by a nice Geneve or Seamaster in the £400 - £750 bracket.
As
@gbesq suggests, go for a stainless steel case which you can wear dressed up, or down. Gold plated (and IMHO, gold capped) are less wearable and, like sub-dials, a bit dated.