This helmet is special on several levels. First, keep in mind that Vettel's helmets are close to impossible to obtain. There are mainly available through auctions for his charity organization "Wings for Life". The 2013 Monaco GP winner helmet went for 76,000 GBP https://www.redbull.com/gb-en/webber-vettel-auction-bonhams In 2011, Vettel arrived third at the Japanese GP but this victory has concluded the season and gave Vettel his second world champion title. It is signed on the visor.
This helmet has been used during testing / qualifying