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GB-Penny Red - Green paper on back is possible?

Posted: Thu Oct 14, 2010 7:00 pm
by asmodeus
Image Image

Hello to all!

A stamp collector from Canada needs your professional advice! I hope you can help hinm out...

Question:
Hi,

I have this stamp and there are lot of green dots on back. Some part are green too. Is it possible or it is damage?