The longtime California art dealer is facing up to 15 years in prison

Establishing ownership and value of works can be a complicated business, as recent legal cases have shown

At least $230,000 worth of art and ephemera is being offered to repay creditors in the gallery's 2013 bankruptcy

Chrismas, who was arrested by the FBI in 2021, is also facing up to 15 years in prison if convicted in a separate criminal case

Chrismas, who founded the Los Angeles gallery in 1967, is accused of embezzling the funds while acting as the estate’s trustee and custodian