Pope Francis autographs a Lamborghini Huracan coupe presented by representatives of the Italian automaker at the Vatican in this 2017 file photo. The custom-built 2018 Lamborghini is back on the block, this time with an online fundraising platform, not at an elite European auction house. (CNS/L'Osservatore Romano)

Vatican City — A custom-built 2018 Lamborghini Huracan coupe autographed by Pope Francis is back on the block, but, this time with an online fundraising platform, not at an elite European auction house.

The Italian luxury carmaker donated the white vehicle with gold stripes -- to match the white and yellow of the Vatican City flag -- to the pope in November 2017. The pope had put his diminutive signature on the car's hood, then the vehicle was put up for auction to raise money for charity.

However, it turns out the final bidder at the Sotheby's auction in Monaco in May did not finalize the transaction and the promised $800,000 sale fell through, according to information provided by Lamborghini.

In an effort to still raise funds for a good cause, Lamborghini has decided it will offer people around the world -- not just the highest bidder -- the chance to win the unique vehicle.

Donations begin at $10 in order to enter the contest, according to the campaign at www.omaze.com/experiences/pope-francis-lamborghini.