Eclipse is a recessive mutation.
No history yet
The word Eclipse refers to an eye trait where the eye is completely covered. 
The body is unaffected by this trait.
The belly is unaffected by this trait.
The tail is unaffected by this trait.
No known proven lines
There are three different forms in which the Eclipse trait appears. The forms are also unrelated. They are: Mack Super Snows, Tremper Eclipse, and Blizzards.