Philadelphia, April 28, 1808. Single vellum sheet, 18 1/2 x 23 /12 in. (470 x 596 mm). Partially-printed document in Latin, signed by Signer of the Declaration of Independence from Pennsylvania, Benjamin Rush (1746-1813), being a diploma from the University of Pennsylvania, naming John Perkin a Doctor of Medical Science; counter-signed by 12 professors, including notable physicians William Shippen, Jr. (1736-1808) ("Guilemus Shippen"); Caspar Wistar (1761-1818) ("Casparus Wistar"); Robert Patterson (1743-1824) ("Robertus Patterson"); paper seal intact at bottom. In mat and in frame, 25 x 30 in. (635 x 762 mm).