Coat of arms of Santiago de Guatemala

This emblem of Saint James of Guatemala was carved on a volcanic rock just as many of the architectonic details of the formerly known as La Muy Noble y Muy Leal Ciudad de Santiago de los Caballeros de Guatemala, or The Very Noble and Very Loyal City of Saint James of the Knights of Guatemala. 

Can you tell me where can one find this very particular coat of arms of Santiago de Guatemala?

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