Leland’s is auctioning off one of Secretariat’s horseshoes, according to WHAS 11.

The iconic racehorse became the first to win the Triple Crown in 1973 and still holds the fastest Derby time of 1:59:04.

The aluminum shoe being auctioned was applied for Secretariat’s groundbreaking race at the 1973 Kentucky Derby.

According to Leland’s, the shoe was originally given to the Chenery family from Secretariat’s trainer Lucien Laurin, and up until auction it remained with the family in their Meadow Stable archives. The horseshoe is displayed with a note from Laurin certifying its authenticity.

The shoe has scuffs, marks and track remnants from racing and also the rivet holes that were used to secure Secretariat’s distinctive felt pads.

Leonard Lusky, president of secretariat.com, says that the horseshoe could become the most expensive ever sold.

Previous horseshoes of Secretariat's have sold for about $30,000 according to Lusky, but this is the only shoe the family plans on selling from the 1973 Derby.

The horseshoe is up for auction until Aug. 17. The current bid is at more than $21,000.

For more information on the shoe or to make a bid, visit Leland’s website.