These are the medals for the New Years Double races that took place on December 31, 2012 and January 1, 2013 in Allen, Texas.
The New Years Double features a marathon, half marathon, and a 5K on both the 31st and the 1st. When you run a race on either day you get the appropriate medal for the day (the smaller ovals in the photo above). If you run a race on both days (any combination), then you get the larger plate as well to hold the other two medals making one BIG Challenge medal (5 1/2 inches).
MORE PHOTOS OF MARATHON/ULTRA MEDALS AND BUCKLES
[Medal photo submitted by JessicaRuns. Follow her on Twitter @JessicaRuns]