And still more with details...
Note that in my searches, I came across an ancient Singhalese coin called a maneless lion coin. On it's back is a similar 4 point pattern in a cross pattern(or am I just imagining things?).
http://coins.lakdiva.org/ancient/maneless_lion.html
This coin goes back way too early for the time period of this sword, but perhaps the marking remained? Likewise, I couldn't find any evidence of one, but I've heard there is a Dutch coin called a dump that might have a similar marking dating to the 17th-18th century. Does anyone know of this coin?