A keen-eyed flea market shopper in Connecticut who bought a delicate blue-and-white porcelain bowl for just $35 is now sitting on a fortune, as the small object goes up for sale at Sotheby’s New York next month, where it could fetch up to $500,000.

In a press release, the auction house said the shrewd consignor had an inkling he had something special, and brought it to a specialist at the auction house.

The Mind Dynasty-era bowl, it turns out, dates to the 15th-century Chinese Yongle period and is extremely rare, with only six companion pieces known in existence. And all of those are in the collections of world-famous institutions such as the Victoria & Albert Museum, the British Museum, the National Palace Museum in Taipei, and the National Museum of Iran.

Measuring just over 6 inches across, the bowl was created in a typical shape resembling a rounded lotus bud or chicken heart, tapering to a pointed base atop a short foot.

Blue and white “floral” bowl, Ming Dynasty, Yongle Period. Image courtesy of Sotheby’s.

The work bears a classic “heaped and piled” method of painting, where the deep cobalt blue appears almost violet because it has been applied so heavily. It is decorated with a striking medallion, and accented by quatrefoil motifs and stylized floral patterns resembling blossoms of lotus, peony, chrysanthemum, and pomegranate flowers.

In an essay in the Sotheby’s sales catalogue, Regina Krahl, a specialist in Far Eastern ceramics, writes that it is “in every respect… a quintessential Yongle product, made for the court, showing the striking combination of superb material and painting with a slightly exotic design.”

The item will be auctioned off on March 17 in New York. Its low estimate is $300,000.