La Capitana Shipwreck - 4 Reales - Dated 165X - Assayer "O" (Rosa the Wheel)

Denomination: 4 Reales                                                                         Weight: 13.56 gm  ​Mint: Potosi, Peru​                                                                                        Reign: Philip IV      Assayer: "O" Juan Rodriquez de Rosa - O with dot in the center - "Rosa the wheel" Date: 165X​ Description: Potosi, Bolivia, cob 4 Reales. Obverse: Full cross and tressure with bold upper half of countermark at upper right, bottom half of date in legend. Type G - Crown over L, countermark. Reverse: Full Shield with bold full P-O to left and 4-O to right.  History: La Capitana sank in October of 1654 off the coast of Chanduy, Ecuador. The 1,200-ton Spanish galleon was the largest built in Colonial America during the 17th Century, and the flagship of the Vice Royalty of Peru, and the South Sea Armada. This ship was commissioned to carry Spanish Coins including the Potosi Mint scandal coins, the subsequent countermark coins and many others dated from