My earliest folded letter is official US Post Office Business. The outer wrapper of the letter:
It was sent by Joseph Habersham, the Postmaster General of the General Post Office, or what we now call the Post Office Department.
It is addressed to a Mr. ---- Selhurst. Dated on the inside for July 16, 1798, it has no postal markings because it was enclosed in a separate letter to the then current New Germantown NJ postmaster, Walter R. Cole, who had announced his intention to resign.
The following letter copy is extracted from the Postmaster General's Letter Book for the years 1798-1799
, found on the US Philatelic Classics Society website, and notes that my letter was sent to Selhurst as an enclosure within the letter to Cole. [I assume the original of this Cole letter did not survive.]
The contents of my letter is a part-printed form advising the addressee -- Selhurst -- that he is to be appointed as the new Postmaster at New Germantown, NJ:
Although not sent with this letter, here is the Postmaster Commission for Selhurst sent shortly thereafter:
An uncommon combination of items.