“Day 90: Despite looking very similar, these are actually two separate single note sets, both issued in 1921 by the city of Thale a. Harz. Both notes have a denomination of 1 Mk.
The first note features depictions of the city councilors at the time the note was issued. The second note features a depiction of one of the local national parks.
The catalog value for these notes are ~ $4 - $5 each.”