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This is a seal from the book "Lesser Key of Solomon". According this text, the spirit Murmur, is described thus
"The Fifty-fourth Spirit
is called Murmur, or Murmus, or Murmux. He is a
Great Duke, and an Earl ; and appeareth in the Form of
a Warrior riding upon a Gryphon, with a Ducal Crown
upon his Head. There do go before him those his Min-
isters with great Trumpets sounding. His Office is to
teach Philosophy perfectly, and to constrain Souls Deceased
to come before the Exorcist to answer those questions
which he may wish to put to them, if desired. He
was partly of the Order of Thrones, and partly of that
of Angels. He now ruleth 30 Legions of Spirits. And
his Seal is this, etc"