Kilophot (1905-1930 approx) was a litho printer and also produced photographic paper.
In the 1920s the firm split and the postcard production stayed with the founder, Felix Leutner. (In this last period the cards bore his name).
from Lehmann Adressbuch 1914 (top) and 1925 (bottom)
Kilophot 6--4
Kilophot 6--4 rev