The bank laid the blame on the paper and placement of the OVI feature in the center of the note where it is subjected to the most folding. On 4 June 2013, the bank announced it improved the paper quality and shifted the placement of the OVI feature to avoid being folded. Beginning 17 June, the bank put a limited quantity of the new notes into public circulation for three months to determine if these changes solve the problem.
These notes are like the preceding issues, but with new date (2013) on back.
Courtesy of Phil Martin and Heinrich Lindner.