The painting was given to the foundation by an anonymous European collector.

Four bidders went for the photograph, which sold to an anonymous American collector for $336,000.

However, in 2006 a copy of a very early test engine was sold at auction to an anonymous collector who bought it for 2,500 dollars.

Less than six months later, the card was sold to another anonymous collector for $2.8 million.

It sold to an anonymous collector for $2.9 million.

On loan from an anonymous private collector, the paintings remain on view through May 22.

The painting was bought by an anonymous collector over the telephone after competition from at least four other bidders.

An anonymous private collector was said to have snapped it up.

The card sold to an anonymous collector for $45,231, over six times the reserve price.

Two years ago it was sold to an anonymous collector for $2 million, according to American paintings experts.