“Day 93: This is a single note set issued on July 15th, 1921 in the city of Bielefeld. The note has a denomination of 25 Mk. The interesting thing about this note is that it is not printed on paper! It is printed on two pieces of linen and then sewn together.
Notes like this are sometimes referred to as 'Stoffgeld', which translates basically to 'Material Notes', or notes printed on unusual/non-paper materials. Bielefeld is one of the most famous and prolific producers of Stoffgeld pieces of Notgeld, with notes printed on linen and silk being the most common.
The catalog value for this note is around $25 - $30, although they sometimes sell for more due to their novelty and desirability. Here you can find more info about this set and others.”