IMPRESSED CROWNED MARK FOR M.(ANUEL) MAFRA CUNHA, CALDAS, CIRCA 1890

See Katz, Portuguese, p. 31, fig. 8 for a similar example Courtesy of Cara Antiques, Newtown, Pennsylvania and p. 47, fig. 43 for an example from the Collection of Marty Frenkel and Barbara Barbara, Los Angeles, California.