Thank you for your reply. I have too many questions! I guess what I would like to know is, should I have this stamp professionally looked at. I am never going to be able to properly measure this. Is there another stamp that I can lay next to it? Maybe a side by side comparison? I have
inherited many stamps and really am lost. I am aware that the rare issue of this stamp is just that, rare. The stamp that I uploaded is uncancelled and attached to another and I have another one that was placed on a postcard. Thank you again for your response.