In german forums items with such a thick seam as you can see it around the rune are said to be fake. They say this had to be done by a modern electric machine.
The first electric sewing machine was invented before 1930, and if one looks at some german insignia like breast eagles you can see that it was possible to have a nice tight stich like this. I have seen americam ww2 uniforms where the patches were sewn on this way... so i guess you cant really tell just by looking at the seam unless its a seam type that wasnt possible before 1945 , but here we would need a proffesional who does not only collect militaria but also knows about the history of working with cloth.
So am i right that by just showing this banner here no opinion can be given if fake or not?