AUSTRALIA: 50 Dollars (ND 1975) in dark brown on multicolor unpt with Lord Howard Walker Florey at right. S/N: "YCZ 588430". WMK: James Cook. Signatures by Knight and Wheeler. Printed by NPA (without imprint). Inside holder by PMG "About Uncirculated 50". (Pick 47b) & (Spink RBA B15b).