Nico Rosberg on Thursday urged his fans to keep an eye out for a stolen race helmet.

The German said his distinctive yellow F1 helmet was stolen at 2am in the hours before his home grand prix at the Nurburgring in July.

Rosberg, who published a photo of the theft taken from the FIA's security camera in parc ferme, said the helmet was stolen from Mercedes' "security-guarded garage".

Rosberg also gave details of the helmet's unique registration and FIA labels.

"Let us know if any of you see (the helmet) on eBay or somewhere else," he wrote on his personal website.

Schuberth's F1 helmets are worth thousands of euros.