I can't tell you too much other than it's beautiful and it's an awesome find. Congratulations.
Where I live (central MD) Indian relics are VERY hard to find. The Indians were run out of this state very early. I have found one hand ax and that was after well over 100 hours of creek walking and picking up thousands of rocks.
I would like to know more about this one also. It is rare that you find one that large without breaks. Find out what it is and update us. I would think that it should make banner with more information because it is in such good shape.
If you do much artifact hunting I would recommend the Overstreet guide. You can look it up on Amazon.
No disrespect intended but the in house "experts" have spoken. The Grim Reaper has handled artifacts from all over the country for over 40 years, his word is gold. An 11 inch Dove Tail....come on guys....really?!
BUT.....you didn't say "I found this"! Did YOU find this? Where(close is okay) and under what circumstance?
It also has a look of plastic. Can we get some closer views and maybe of one with a bright light shining through?
AND, the notches where it might be fastened seem too small in regards to the stress that might have had to be endured.