Duke, 10 legions
Rank and legion count as the 1904 edition gives them. The legions come from the phrase that closes almost every entry; the rank comes from the book's own appendix, which classifies all seventy-two and states the metal each rank's seal is to be made in — copper for this one. The entries use rank words descriptively as well — Eligos appears 'in the form of a goodly Knight' and Barbatos comes 'with four noble Kings' — so a rank harvested from the prose would invent titles the book does not give. Only the appendix classifies.
Sources (1)
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Lemegeton
, The Goetia: The Lesser Key of Solomon the King
— The Goetia, spirit 6
“The Sixth Spirit is Valefor. He is a mighty Duke, and appeareth in the shape of a Lion with an Ass’s Head, bellowing. He is a good Familiar, but tempteth them he is a familiar of to steal. He governeth 10 Legions of Spirits. His Seal is this, which is to be worn, whether thou wilt have him for a Familiar, or not.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.