In looking through my copies, I have only found these two with this odd "doubling", but probably a "kiss" print. Perhaps the paper was a bit wet in these areas? Not listed in ACSC, as far as I can tell. What would you call these marks?
Both are Scott 4, first watermark, Die II, ACSC 9. The watermark does not show any marginal lines. (Note that I may have posted the pictures in a much earlier thread, but I didn't find an answer).
First example shows markings in "AU" of Australia and surrounding the 2 1/2d numeral block.
The second copy appears to have this same issue with the right side of the stamp. It starts as the "U" of Australia, and almost all of the right side. The "A" of Postage is particularly affected. There is a slight indication in Roo's tail.
I'm looking for the correct descriptive term of this feature. Not any additional value, I'm sure, but pretty nice presentation pieces.
Edit. First pictures replaced.