The victim was in his car in the car park at the skatepark off Church Lane in Fradley, near Lichfield, at about 11.50pm on November 13 when he was attacked.
A group of about five males wearing balaclavas, gloves and tracksuits assaulted the victim and kicked him in the head.
He sustained facial injuries during the attack.
They made off down Hay End Lane – believed to be in the direction of Alrewas - with the victim’s Audi RS7, which has since been recovered, and a gold Rolex watch they were wearing.
Anyone with any information should message Staffordshire Police on Facebook or Twitter quoting incident number 869 of November 13, call 101 asking to speak to DC Jason Hughes of Lichfield CID or alternatively contact Crimestoppers anonymously on 0800 555 111.