One piece of unique armor still applies bonus?

One piece of unique armor still applies bonus? - Blue Abstract Painting

If I'm wearing a full set of armor (like Dwarven) except for the helmet, which is a unique one (for exapmle the Visage of Mzund), will I still get the 25% bonus for wearing a full set of armor? I know I need a perk to get that bonus, I just want to know if I can have the bonus like that.

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