With a help of his wife Corinna, Schumacher added his initials, “MS,” to the helmet, which now includes the signatures of all 20 living F1 world champions. The helmet is being auctioned to raise money for Sir Jackie Stewart’s charity, Race Against Dementia.

The helmet is designed to look like the one Stewart used during his racing career. It’s white with a red Royal Stewart tartan stripe around the top. Stewart, who won the world title three times, will wear the helmet during a special lap at the Bahrain Grand Prix. He will drive his famous 1973 Tyrrell 006 car around the track, just 20 minutes before the race begins. The lap also marks 60 years since Stewart’s debut in Formula 1.

The money raised from the auction will help fund research into dementia, a disease Stewart knows well as his wife Helen was diagnosed with it in 2014. His charity is now working with the University of Cambridge on a new blood test that could help doctors detect the illness earlier.

Stewart told the Daily Mail: “It is wonderful that Michael could sign the helmet in this worthy cause – a disease for which there is no cure.

“His wife helped him, and it completed the set of every single champion still with us.”

Michael Schumacher has been out of the public eye since 2013, after a serious skiing accident left him with a brain injury. Although he no longer appears in public, his small contribution to this project has great meaning, for both Formula 1 fans and those affected by dementia.