■ 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 : 80 YEARS ON AND STILL GOING STRONG / 1931-2011 … in centre : crouching maori warrior with taiaha (spear / fighting stick)

■ Dimensions : 45.0 mm … ■ Weight : 38.8 g

■ Materials : silver coloured brass … with blue enamel

■ Maker : ELM (on edge)

■ NB : maori warrior appears to be identical to that found on New Zealand one shilling coins from 1933 to 1965 … also for Founder jewel in Antient, Free and Accepted Masons