It is the Gotz-feather indeed, PLaymofool ...
Oh, all right then - I'll get that set up properly. By the way, this shape, what I call "Feathers, long, draped", is called on the German playmobil.de site, "Feder-helm-angreifer", if that's any help.
Doesn't answer the wonder about the other shape, though (called by me, "Feather, wide, curved"; called on playmobil.de "Federbusch"), which ought to have an older number.