1977年香港伍毫错版。铸于红铜坯饼上，而非正常的镍黄铜合金。光泽亮丽的红砖色表面，悦目佳品。HONG KONG. Mint Error (Wrong Planchet) 50 Cents, 1977. PCGS MS-64 RB Gold Shield。KM-41. Error coin, struck on a copper planchet instead of its normal nickel-brass. An attractive example with lustrous red-brick surfaces。
