Alfred Nathaniel Oppenheim ( 1873 - 1953 ) was a German painter. Alfred Nathaniel Oppenheim s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1150 USD for Glockenblumen - Bell Flowers in 2004 to 4123.87 USD for Sommerlicher Garten in 2012 , based on the size and medium of the artwork.