Rare 1960s or early '70s Halloween mask!

This appears to be from the late-1960s to mid-1970s, a time when I was going out to trick-or-treat on Halloween. I never saw one of these then, or I would have HAD to have it! What a gruesome, garish get-up! Delights me to look at it.

Picture taken by me; mask and costume from the collection of Raymond Castile.