The A side composer is Léo Blanc, not two different people called Léo and Blanc.
A side (mx. 23154) recorded Berlin, May 23, 1938.
B side (mx. 22925) recorded Berlin, March 5, 1938.
Originally released on red label with the slogan "Die Deutsche Weltmarke"
1940-1942 represses on blue label.
1950-1953 represses on red label without the slogan "Die Deutsche Weltmarke" and with different A side composer listings (Leo Blanc et Hernandez)