Tostão 'o-o' - Manuel I Lisbon mint

The tostão was introduced under Manuel I as part of a sweeping monetary reform that rationalized Portugal's silver coinage around the new 100-real unit, itself a product of the immense wealth flowing in from the Estado da India after Vasco da Gama's 1499 return. Lisbon's mint was the operational center of this system, handling volumes of silver that colonial trade made newly abundant.

The 'o-o' designation in Gomes refers to the specific punctuation variant separating the mintmark and value on the die — a distinction invisible to casual handling but critical for attribution within this type.