C Bertram Hartman ( 1882 - 1960 ) was an American painter. C Bertram Hartman s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 555 USD for R.C.A. Building, New York City in 2004 to 20000 USD for TWO NATURES in 2009 , based on the size and medium of the artwork.