Okay, let me put this up while there's still time: If you should happen across this thread in the future, and you see that it's been CLOSED because people have ignored warnings from a moderator, please search for "1878-P trade dollar, Part II" for any further ON-TOPIC updates. Sigh.
Sorry we jacked up your thread. You have a really cool Trade dollar. Hope you can figure out it's history.
I apologize to all my fellow collectors and the OP for hijacking the thread. It is a great coin, and I am so glad it turned out to be historic, genuine, and such a major curiosity/ rarity. Congrats to the OP.