Surely its not the absolut equal hallmark,but its a variation of it.Perhaps its the hallmark of his son etc,but I´m sure its sussmann. There are too many equals.First the I S,
then the Pinzette.(tool) Then the item on top of the tool.Nobody would start with the nearly equal Hallmark of Sussmann and then with his Initials.----May be I´m not right,but I´m very sure,I´m right.
S I would mean the Maker would have made a fault.Normally both hallmarks have the same position,not one in the right manner and the other upside down.Since I saw french flatware ,I never saw such a hallmarking upside down to the minerve.------