A work once thought to be by Vincent van Gogh but later dismissed has now been confirmed as an authentic painting by the Dutch master.

Still Life With Meadow Flowers and Roses has belonged to a Dutch museum since 1974, but doubts crept in due to the painting style and the unusual canvas size, and it was discredited in 2003.

However, experts have now authenticated the painting using an X-ray technique. Van Gogh originally painted a canvas of two wrestlers and then painted Still Life With Meadows and Roses over it, which experts say accounts for the “uncharacteristic exuberance” of the floral still life.

“Almond Blossom,” by Vincent Van Gogh (1890)

More than 30 years after it was stolen from a French museum, Camille Pissarro’s “Le Marche aux Poissons” (“The Fish Market”) was handed over to the French ambassador by U.S. Immigration and Customs Enforcement on Wednesday.

The roughly greeting-card-size work is a color monotype, a one-of-a-kind print made by painting on glass and then transferring the wet paint to a piece of paper.

Wednesday’s return was staged in a hall of a Washington museum filled with other French impressionist works, including some by artists who were inspired by Pissarro.

The customs bureau said that since 2007 it has returned more than 2,500 items to more than 22 countries.