The ebay seller looks, at face value, like a genuine business but does seem to be in the habit of 'borrowing' other peoples pictures as you will see in their web page here....
https://www.rbwsportsandclassics.com/current-stock.html
Based on that I would steer well clear.....
(for readers who don't know, both the Sammio's in the picture were built by well known members of this forum and to the best of my knowledge their cars have not passed through this dealers hand)