“Day 72: This is a 5 note set issued in 1922 by the city of Carlshafen. The denominations included in the set are 50 Pf, 75 Pf, 1 Mk, 1.50 Mk, and 2 Mk.
If you take a look through all the photos, you'll notice that the serial numbers on each note are the same. This is what some collectors refer to as a "true set", meaning that these notes were all originally issued together as a set and have remained intact until present day. Sequential serial numbers can also be an indicator of an original "true set". Not all sets of Notgeld were originally issued with matching or sequential serial numbers though, but some were.
The catalog value for this complete "true set" of 5 notes is around $20 - $25. Here you can find more info about this set and others.”