This standard dodecagonal cupro-nickel 50 cent piece weighs 15.55 grams at 31.51 mm in diameter. It features the standard Ian Rank-Broadley effigy of Queen Elizabeth II. 20.
Its distinctive dodecagonal (12-sided) shape was combined with a new reverse design featuring a thrift plant.
New Zealand fifty-cent pieces, and Australia's previously round but now dodecagonal fifty-cent piece, although valued at five shillings in predecimal accounting, are both smaller than crown pieces.
[edit] Mintages
Edward VII ...
There is no clear distinction between obverse and reverse on this coin and it may even be said to show two reverses. The specimen was struck on a dodecagonal 50c planchet.
The coin is dodecagonal having twelve sides, and was the first coin of its shape, and also the first coin to be struck in nickel brass.
The design on the reverse of the coin is a thrift plant, commonly called a sea pink.
 See also: Silver, Coin, Mint, Reverse, Revers
  
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