A 328-game winner across 12 major league seasons, John Clarkson was elected to the Baseball Hall of Fame in 1963, an honor delayed for no apparent good reason.  This pose, #78-3, can be found picturing Clarkson with either Chicago or Boston, who purchased him in April of 1888.  This example identifies him with Boston.  Graded VG-EX 4 by PSA, the card is sharp, with some toning darkening the overall image but the photo still clear and visible.  Corners are sharp and the image well-centered on the canvas, with a clean reverse.  A fine-looking specimen with above average image quality.