Registry Envelopes Collection,17 mint envelopes plus H&G C6, C8, C13 used faulty and/or stamps missing and a C21 favor cancel, mint envelopes include C1 (3 including one light overall toning), C3-4 (2 each), C3a (3), C6, C7 (even toning), C8 (2), C16, C20 (2 including one with backflap toning), generally fresh and fine to very fine