Rare Kienzle prototype melody clock

This clock might be the rarest in my collection. Its a Prototype/Sample clock with a switchable chime/strike. Melody is: • Ich hatt' einen Kamera... , the other is the regular Bim-Bam strike.
From the german clock museum Furtwangen:
The clockwork dates from around 1918 to 1920 - and was probably converted to melody from 1933.
However, for whatever reason, this melody never went into series production - the Potsdamer Gong and Horst Wessel Lied were built - not this type. Not this kind of chimes either
I already own a Potsdamer Gong clock as well.