Exactly the reason for posting, serves to help those trying to purchase a genuine coin not to get ripped off.
There was one on Ebay using a photo 'borrowed' from previous genuine listing, ask Seller for additional images and be specific as to the image required, any Seller wanting to sell their coin will oblige, get no response or an excuse, leave well alone.
Everyone is different, each will find a feature that stands out to them, for myself IRB on the Obv and gap between swimmers breast and waves on the Rev,