carimbo de sinete (ou cunho metálico) de forma cúbica, usado para gravar marcas em cera lacre ou - Seal Antique

The cubic-shaped carimbo de sinete, or metal seal stamp, is a distinctive antique tool designed to leave marks or imprints in sealing wax or similar materials. Its cubic form indicates it might have different engravings on each face, allowing for multiple seals in one instrument—a practical feature for users needing versatility. Such seal stamps were integral to authentication practices before modern signatures became widespread, verifying documents' origin or securing correspondence against tampering. Made typically of durable metals like brass or steel, these seals combine functional design with artistry, and they are collectible artifacts providing insight into past communication customs and craftsmanship in metalwork.