These notes feature Fujiwara no Kamatari on the obverse, while the reverse is of a similar design as the preceding.
The fourth issue started on January 1, 1930, and have a design similar to the "purple backs" with the obverse featuring Prince Shōtoku, and Hōryū-ji on the reverse.
The one-year waiting period was not put into place before the suspension and later withdrawal of the sen.
Prior notice had already been given on February 17 with people having the option to exchange old bills for the newly made "A series".
The initial idea was to suppress inflation which invalidated all of the old 100 bank notes that were in circulation at the time.
The switch happened quickly by means of forced deposits which also caused more than one variety of the "A series" notes being made.