Floyd's Penny Post, 68L1, 1c Blue Tied by Black Company Handstamp with #65 3c Rose on Cover to St. Louis

Included as One of Only 13 Covers, in the Blue 68L1 adhesives on Letters Taken to the Mails Census
Floyd’s Penny Post 1c Blue (68L1) with margins close to just in at right, tied by blue circular "Floyd’s Penny Post, Chicago" handstamp on cover to St. Louis, Mo., in combination with 1861 3c Rose (65) tied by blue Chicago duplex. Manuscript notation at top reads: “Keep this envelope. Find out what Penny Post means.”