I recently added this note to my collection. When I checked Standard Guide to Small-Size U.S. Paper Money 1928 to Date by John Schwartz and Scott Lindquist, I was delighted to discover:
There are several cool things about this note other than the serial number: New and smaller Federal Reserve seal Signed by Georgia Neese Clark, the first woman Treasurer of the United States Mule Note — Back plate numbers 112 and lower are mule notes