Scarce late war Waffen-SS Oak zeltbahn with rotating(!) button holes

Extremely rare late war Zeltbahn in Waffen-SS Oak leaf camouflage. The Zeltbahn is nicely made up out of different colours of camouflaged material, typical for a late war manufacture. What makes it so rare is that this Zeltbahn was produced in a small experimental batch between May and July 1944 with not normal but rotating buttonholes. The Zeltbahn is in very strong used condition and has some damages here and there but is the second I’ve ever seen!