“Day 2: This is a fun and colorful set from the city of Erfurt, issued on April 7th, 1921. These sets are very affordable and can usually be obtained for less than $10.
One of the cool details about these notes are the small letters on the bottom left corner of the front side on each note. Altogether, these letters spell out the name "Luther", who is depicted in some of the designs on the back.
There were additional color variants of these sets made, and it can be a fun to seek out and collect all the different varieties of these designs.”