Armourers mark
 

Hi,
I'm looking at an armourers or traders mark on a mid C17th sword. Its really difficult to photograph so I'll describe it. Blade may be continental.

Its a simple heart, with a circle touching the point (with a line through the circle), and springing from the far side of the circle, an ornate cross.

It's ringing a bell where I've seen it before and its driving me mad.

Anyone have any ideas?

a drawing would perhaps be better than 1000 words