Nice example you have! I have a number of G. Appel produced 5.56 kits with WaA in my collection. And a smaller number of KKW kits without WaA (details below). Not unusual in my experience. Thanks for posting .....
G. Appel 1935 DWE WaA139
G. Appel 1936 DWE WaA325
G. Appel 1937
G. Appel 1938 SWE WaA67
cnx SWE WaA20
cnx SWE WaA20
cnx SWE WaA20
G. Appel (painted)