■ Obverse : around edge : THE ROYAL NUMISMATIC SOCIETY OF NEW ZEALAND / ESTABLISHED 1931 … in centre : emblem of RNSNZ : map of New Zealand surrounded by 4 stars and below RNSNZ

■ Reverse : around edge : BENEFACTOR ALISTAIR ROBB PRESIDENT 1971 / FOR SERVICE … in centre : image of Alistair Robb with date box below inscribed : 2015

■ Dimensions : 45.2 mm … ■ Weight : 38.1 g

■ Materials : bronze coloured brass … with blue enamel

■ Maker : ELM (on edge)

■ NB : known service dates are 2015, 2016 and 2017