This pattern is a muling using the obverse of J615/P680 with the reverse of J618/P687. Examples are known as follows: Nickel or copper-nickel J617C/P684 with only one or 2 believed to exist. Copper J617B/P685 also with only one or 2 believed to exist. Aluminum J617A, J720A/P686 with only the Bowers and Ruddy Winthrop sale example confirmed. This is a composite. Photos used are courtesy of Teletrade.