In 2002 agents from the Bureau of Alcohol Tobacco and Firearms (BATF) and National Security Agency (NSA) collaborated to provide authentication and appraisal of this firearm.
Below is an except from an email stating the appraised worth. The names have been withheld in the interest of protecting the agents and their families.
The identity of the BATF Agent would be provided on request to the purchaser.
Click Here for a full size PDF file of the Email excerpt