Brand told the BBC that the discovery was “stunning”, describing it as “the most bizarre case of my entire career”.
He added that, if the painting were to be put on sale, it could fetch a hefty price.
“Such paintings could been sold anywhere between thousands and tens of thousands,” Brand said.
However, the sale of looted art is generally illegal in most countries as the works are seen as being sold under duress.
While this is the case, Portrait of a Young Girl could potentially be sold due to the statute of limitations on its theft having expired.
“I have recovered Nazi-looted art from World War Two before, including pieces in the Louvre, the Dutch Royal Collection, and numerous museums,” Brand continued.
“But discovering a painting from the famous Goudstikker collection, in the possession of the heirs of a notorious and famous Dutch Waffen-SS general, truly tops everything.”
He added: “For decades, the family, who of course bear no personal guilt for Seyffardt’s own crimes, had the opportunity to do the right thing and return this painting. They chose not to.”
However, he later told the BBC without explaining further: “The painting has been handed over to us.”
This discovery draws parallels to a previous case where an Italian master painting stolen from the Goudstikker collection by the Nazis appeared on the website of an estate agent selling a house in Argentina.
