Now, another set of Warhol bills are hitting the market, this time fixed to a hat. In 1972, Andy Warhol covered a black straw Halston hat with $10 bills, one of which he signed, as a gift for his close friend Robert Giller on his 30th birthday.

Until now, the hat has not been seen in public. It has made its debut at Nye and Company Auctioneers/Appraisers of Bloomfield, in New Jersey where it will be sold at auction on November 11.

The unusual objet d'art was consigned by Giller's widow and is expected to fetch between $800 000–$1 200 000, not quite as much as Warhol's other works with dollar bills, but an incredible price nonetheless for an object which was previously unknown to the world.

In Warhol's Andy Warhol's Exposures, 1979, there is a photograph of Giller wearing the hat. To accompany the sale of the hat is a copy of this book in which Warhol inscribed the message "To Doc/Love, Andy."