NEW YORK (AP) — Two nearly identical Tiffany wisteria lamps designed in 1901 could sell for up to $1 million each at auction next week.

They are among a group of seven Tiffany lamps collected by dealer Sandra van den Broek over a 30-year period. The current owner acquired them over the past 10 years.

Sotheby's is selling them Dec. 17.

The two wisteria leaded-glass lamps are successively numbered, indicating the 2,000 pieces for each were cut from the same sheets of glass. They came into Van den Broek's possession 15 years apart.

The shade was designed by Tiffany Studios artist Clara Driscoll.

The auction features 34 other Tiffany lots. Among the highlights is a 25-light lily chandelier owned by descendants of the Havermeyer family. It has a pre-sale estimate of $150,000 to $250,000.