otherLegibility: low
Part 16, page 405
Open in FBI Vault (Part 16, page 405 of the PDF)
FBI 164-81, Vault Part 16 p. 405 (DB Cooper-4783), Letter, serial SE 164-81-1380 (as read from the transcript) — cooper.theunsolved.net/parts/Cooper-Part-16/pages/405
Transcript
The scan is the source; the transcript is machine-generated from it.
[illegible handwritten text across upper and middle portions of envelope]
[Bottom left corner marking:] [illegible, possibly a number or initials]
[Bottom right footer:] DB Cooper-4783
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FRANK LLOYD WRIGHT [guess: 2c] U.S.A.
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DB Cooper-4783