1555, Mexico, Charles & Joanna. Early Pillar Silver 1 Real Cob Coin. Assayer: O Mint year: 1516-1656 Reference: CCT-150. R! Mint Place: Mexico (Mo) Denomination: Silver 1 Real ("Late Series" with waves below pillars). Ruler: Charles I (as King of Spain – Charles V as Holy Roman Emperor) together with Joanna of Spain. Diameter: 22mm Material: Silver Weight: 3.06gm Obve ...