Constant Mayer (attributed To) ( 1832 - 1911 ) was an American painter. Constant Mayer (attributed To) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 398.5 USD for Young girl sitting in a windowsill in 2009 to 2200 USD for Portrait of Julia Greer, Age 21 in 2015 , based on the size and medium of the artwork.