The Production Report by BEP for September 2017 shows an addition of 3,200,000 notes for the St. Louis district (H). Out of the 12 Federal Reserve Banks, four have now ordered these notes.
These notes were produced at the Western Facility in Fort Worth, Texas while others were printed for the New York, Atlanta, and San Francisco banks.
The serial numbers of Series 2013 notes start with the letter M. The second letter represents the Federal Reserve district — B for New York, F for Atlanta, and L for San Francisco. These notes were first printed from November 2014 to March 2015 but were delivered to banks recently to avoid confusion in the market.