My Great-Auntie's Doll

I could really use some help trying to identify the maker of this doll. After hours of searching on the web, could it be Gebrüder Kühnlenz made in Germany? I believe the markings say 170. This doll belonged to my great aunt and the family was from Germany? I haven't found any others with the "Real Kid" label on front of body. Trying to figure out a value to place on her. She is approximately 19" tall and missing one of her lower arms. Could she be rare or am I just looking in the wrong places? Any help would be greatly appreciated. Thank you.