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This is a seal from the book "Lesser Key of Solomon". According this text, the spirit Valefor, is described thus
"The Sixth Spirit is Yalefor. 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."