Agence Keystone ( 1927 - ) is a painter. Agence Keystone s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 576.28 USD for Le désastre du R101, 1930 in 2006 to 1056.77 USD for Série d'avions in 2006 , based on the size and medium of the artwork.