^Lot 75 Small Spanish colonial silver "plata corriente" cut piece with partial tax stamp (early to mid-1500s

Small Spanish colonial silver "plata corriente" cut piece with partial tax stamp (early to mid-1500s), 1.14 oz troy (35.36 grams). Roughly 1¼" x 1" x 3/8". A roughly wedge-shaped chunk with some natural edge within two rough sides as broken from a "splash" ingot, one side quite rough (as made) but the other somewhat smooth and bearing a very clear circular tax stamp with REX+P showing, light tan sediment in crevices, XRF tested at 65% to 88% silver with 6%-9% lead and 5%-25% iridium (no copper), approximating the value of an 8 reales in its time.