Mechanist's helmet (Automatron)

Both the Mechanist's armor, and the matching Mechanist's helmet, make up this costume in the Fallout 4 add-on Automatron, and is worn by the Mechanist.

Characteristics
The Mechanist's helmet provides a Damage Resistance of 13 against physical damage, as well as another bonus of 13 against energy weapons, with a set bonus included that also reduces the damage taken from robots by 15%.

Locations
Found being worn exclusively by the Mechanist, in which the costume can be looted off of her corpse.