EICKHORN has had the navy scabbards with the "built-in" ("pushed out") scabbard bands. It is quite easy: current knowledge is that brass scabbards with this certain configuration are postwar, iron scabbards (with a surface "gilting") are period, pre may 45.
Simply to check with a magnet.
Regards,

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.