It's not a "Bureau Number", that's USN. The brass radio callsign plate will still be attached to the instrument panel and many of the access panels (including engine cowls) will have the Lockheed 4 digit constructors number stamped into them. DPAA recovered an MIA from an underwater crash...
An old thread, but thank you for providing access to these incredible manuals. I'm looking for Kawasaki Ki-61 Type 3 Fighter manuals. Does anyone have access to this/these manuals?