This is LEGO® part #60748 Minifigure, Headgear Helmet Castle with Cheek Protection and Studded Bands.

This part in this color is considered a Non-Production Part or Q Element. This means that it is an official LEGO® part that never appeared in this color in a regular set. These elements are often produced for Master Builder models so that large scale models can have a broad color palette.

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