a letter or a piece of writing that has an official seal or stamp (see Molina)
Alonso de Molina:
amatlacuilolmachiotilli. carta o escriptura sellada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4v. col. 2. Thanks to Joe Campbell for providing the transcription.