`JLLebbert and Jingi, my main problem is that on my screen I can not see a missing die cut (peak). It is possible that half a peak is missing. These stamps are printed in a continuous sheet of paper called the web. If everything goes as planned, the knife separates the rows through a 'knoll', in principle a peak cut in half. If the row separation is not perfect this 'knoll' can occur anywhere on the stamp. In that case it is a freak!
I do not believe the piece of paper attached to the stamp gives it any more value; why don't you soak it off? Than the "missing perf" will become more visible.
Two publications are available from the PNC3 club addressing these varieties: ;Avery Die Cut Varieties" and "CCL Die Cut Varieties". These two loose leaf publications are full of color photographs of all the different possibilities.
Go to
www.pnc3.org for more info.
Peter