Of course this overprint have different colors, but your's is not one of them
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Blackish brown to me. It certainly looks like the normal color. Does Scott still say "brown"?
Scott is very limited as usally for Austria , only brown and 35 cents , Michel also limited describe it as schwarzbraunem
The expensive varieties are listed in the Netto Katalogen, and this stamp is not one of them,
it's a plain semi-postal 35 cents value , that's it