Teorica, y practica de esquadrones, deducida del tesoro militar
Teorica, y practica de esquadrones is a military treatise on cavalry and infantry formations, written by Antonio de Heredia y Estupiñan and printed in Lima in 1660 by Joseph de Contreras for a Spanish military readership. The picture is a gold-stamped armorial emblem on tooled leather: a crown above a saltire of shields, quartered with small crosses and wreathed in laurel. A designer might take from it a dense, symmetrical heraldic roundel, useful for gold-foil seals, crest motifs, or historical badge layouts.
