For what it's worth, to my eye, the last five letters appear to be 'ONSON', but just can't really make out the other letters obscured by the mark they were struck over, but suspect the first letter may be an 'S'. Whether I matched the size of the letters or the outline to the size of the mystery mark, seems clear the 'Jörgenson/Jörgensson' mark is not a match...
~Cheryl