Just a few silly questions.
Did you measure the perforations to verify Perf 11?
Can you show us the reverse?
Why do you think it is a $11,000 or $175,000 stamp rather than a 20 cent stamp?
Also, there is a very large stamp show in your area in a few weeks. You can bring it there for experts to look and verify your assumptions. Check out Sescal at:
http://www.sescal.org/