Comment: If it were marker instead of ballpoint or felt-tipped pen...

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In reply to comment: Its just a rubber stamp. (see in situ)

If it were marker instead of ballpoint or felt-tipped pen...

it would be more difficult, but not impossible, to analyze the handwriting for personality clues, with help from this book:
http://www.amazon.com/Handwriting-Analysis-Complete-Basic-Bo...

9-11 was a panda job.