Just the staggered 17in wheels and arch trims - not even a boot badge (well could have removed as the C230 badge has been). Seller either doesn't know his Mercs very well or is assuming the punters don't.
Looks OK though - and I've seen several like this (nearly bought one, it was low miles but close up not well looked after) probably options added by the dealer to make the cars a bit more special, or close the deal.