I only have Gibbons with me right now, but this should be your watermark:

Sadly, the world being full of jerks, the first question with these is, "are my punctures okay?"
Get some good magnification and see if the cancel ink wept into the holes, or if it looks like the punctures came after the cancel.
I'm sure someone else will be along with more information shortly, but if not, I'll be rejoined with more of my library in a handful of days.