Hi,
it would be easier if you´d shown the whole jacket, as from the label it is not clear if he belonged to Fuß-Artillerie or Feld-Artillerie. As there seemingly was no Fuß-Artillerie Regiment of that number he must have served with the Saxon FAR 64.
There is a regimental history of this unit, but as he was no officer chances are slim he is mentioned in it.
Wagner, Erich: "Das 5. Kgl. Sächs. Feldartillerie-Regiment Nr. 64". Dresden 1922, 142 Seiten (Band 4 des sächs. Anteils der Erinnerungsblätter).
Probably the reason why he was called Kühn II is that Kühn I, given name Arno of same regiment, served in the 2nd Batterie. He was killed in action 1916.
Kühn II seems to have survived the war unharmed.
GreyC