This Hofner Violin Bass has quite a hefty price tag on it, and you'd be correct in thinking there may be a McCartney connection but as a righty you can guess it's not one that he's owned.
However the bass has had its fair share of muso owners, among them Marco Nelson (The Style Council), Damon Minchella (Ocean Colour Scene) and Paul Weller, and it has appeared on quite a few recorded works by each of those artists including Weller's first two solo albums. As well as all this history, the bass has been signed by the world's best known exponent of this style of bass guitar, Sir Paul McCartney himself.
If interested and you've got the cash, snap it up now, because if it doesn't sell on eBay it's going to be auctioned at Christie's.
Thanks to David Brown for bringing this item to my attention.