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aluminium bronze centre in stainless steel ring - eg Australia 5 dollar (1996 Bradman)
aluminium bronze centre in cupro-nickel ring - eg New Zealand 50 cent (1994) ...
Aluminium bronze one dollar coins issued by the Royal Australian Mint from 1993 began to feature a mintmark. Initially the mintmark was a letter C, S or M and later B, E, A, and TV mint marks appeared.
Monel metal is a copper/nickel alloy, also called cupronickel. While the metal "bronze" usually refers to copper/tin alloys, it also is a generic term for any alloy of copper, such as aluminium bronze, silicon bronze, and manganese bronze.
 See also: Aluminium, Gold, Silver, Bronze, Coinage
  
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