Johann Georg Bergmüller ( 1688 - 1762 ) was a German painter. Johann Georg Bergmüller s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1048.77 USD for Maria Immaculata in 2007 to 3866.38 USD for Hl. Petrus mit Hahn und Schl√ºssel in 2009 , based on the size and medium of the artwork.