I didn't post this one Friday because there is enough of a clue on the envelope to give the game away. This is envelope 677, and it went out to Honi C with the addition of one of her excellent faux stamps.
And in the meantime, Jean sent me this clever envelope, which the From Me to You stamp matches perfectly.
Inside was a flier for the Tim Gunn talk Jean attended last year.
I am sure Jean somehow knew I would not pass up the opportunity to use the white space in the name of mail art.