Vintage wood fascinator hat block.
A hat block, also known as a hat form or bashing block, is a wooden block carved into the shape of a hat. It is used by hatmakers and milliners to produce a hat.
A fascinator is a small adornment for the head, attached to a comb, wire, or clip, that perches on the head. No brim, no crown. The term today refers to anything attached to a clip, a headband, or a comb.