 The 12 and 16 bits were holed 8 reales coins, with the plugs from the 12 bits used to make the other coins.Whole plugs made the 6 bits, halved plugs made the 3 bits and the plugs were themselves holed to make the 4 bits.The third series was issued between 1816 and 1818 and consisted of 2 bits and 2 shillings 6 pence (marked 2/6, equal to 3⅓ bits).