UBB.threads Forums Uniform & Accessories SS & SA Uniform Forum Is there a "Sew-on" Totenkopf skull, {plated metal}?

You should send it back and get a refund as it's a fake. It is not even a good fake at that.

M1 not M5 is the code for metal insignia.

However, there are examples of wartime metal insignia being drilled and sewn onto SS visors. For example this eagle on the Waldamar Riefkogel visor.