The estimated profits made from his forgeries is estimated to be more than 30 million dollars .
Thus Hebborn continued to create his forgeries , changing his style slightly to avoid any further unmasking , and manufactured at least 500 more drawings between 1978 and 1988 .
The estimated profits made from Hebborn forgeries forgeries is estimated to be more than 30 million dollars .
Thus Hebborn continued to create his forgeries , changing his style slightly to avoid any further unmasking , and manufactured at least 500 more drawings between 1978 and 1988 .