MEXICO. Mint Error -- Double Struck -- 8 Reales, 1877-Ca EA. Chihuahua Mint. PCGS MS-63. KM-377.2; DP-Ca55. Twice the ordinary number of rays protrude from the cap on this intriguing error coin with clear signs of an in-collar double strike. Aside from this nuance, exceptional satin luster stretches across rather consistent surfaces for the Choice assessment, and hints of original olive tone speckle both faces. Whether well cared for because of its anomalies or by chance, this piece is a delightful error that will enliven any set.