Salaams Kieth, Indeed there is a further puzzle inside this conundrum with the appearance of a W HARVEY ..Below. No Fox there however. Was this a miss strike? Was it done at the same time because Harvey also appeared on its own but with no initial see below...in several formats. ? I will try to address that in my next post...
The point about the H is that it is said to be a Hounslow mark. The confusion is underlined by it appearing inside an animal which looks more like a Labrador than a Fox...

I have only seen one of these. Harvey senior had a son also named Samuel... and Samuel Jr had a son. Both were in Swords but I cannot find the grandsons name...was it also Samuel?
Below are various Harvey blade strikes...plus some randomly applied Passau Wolf and one from Solingen.There is an apparent Shotley sword with a Passau Wolf...There is an H inside a fox? There's an empty Fox. There is an altered SH made to look like SB...for whatever reason and the odd W HARVEY.