Alexander Calder's prominent "Black Crescent" mobile has been removed from the Delaware Art Museum's East Court and its collections database, making it potentially the third work the museum will sell by October.

Museum CEO Mike Miller would not confirm whether the mobile by the late sculptor, purchased by the museum in 1961, will be sold. The Wilmington museum is trying to raise $30 million to repay construction debt from a 2005 facilities expansion and replenish its endowment.