It was in the Potosí mint where the first coins with the date imprinted were produced. The first "dated "coins in Peru are from 1617 (the date is on the upper peripheral portion of the reverse side of the coin). The 2 Reales coin in the images above was designed by Juan Ximenez de Tapia, who marked the coin with the initial "T".
Due to use of the coin and the poor quality of the pressing blanks, the date is not readable. Theses coins were produced until 1652.