(Medical - Medicines) Dr. E. R. Knights, green boxed ad text design for various products including Dr. Larookah's Pulmonic Syrup & Dr. Knight's Oriental Hair Restorer, on cover to Academia, Pa., franked with 1863, 2¢ black canceled by straight line "Paid" handstamp and tied by "Melrose, Mass., Jan 31" cds; cover slightly reduced at right, Very Fine, a wonderful rare early medical advertising usage; with 1981 P.F. certificate. Scott No. 73  Estimate $500 - 750. $0 (Image)