FIRE-BRANDED Books. Pictured here, marks of the Augustinian and Dominican orders.
From the amazing Catálogo Colectiva de Marcas de Fuego.
"Practicing fire brand stands during the colonial period in Mexico, primarily. Evidence indicates that its use began in the second half of the sixteenth century and lasted until the first decades of the nineteenth century. This practice was welcomed in monastic libraries and religious institutions dependent on the clergy. Isolation is no record of some private libraries that hold their own brand.”