I made a research at the Volksbund site, where the German war graves are registered.
It seems that the postcard sender - which I assume was named Karl Göttel - didn't survive the war.
Although there are 10 individuals listed with the same name, eight of them died during WWII and were too young to have fought during WWI. From the others, one was KIA in 1914 - before the mailing date of this card. The final one, KIA in June 6th, 1918, is, unfortunately, a close match, as his rank was Kanonier and he is buried in France - according with some on line references FAR 55 was engaged on the Western Front at that time.
Sad ending, I guess.
Douglas