The Manx Noble is a platinum bullion coin minted by the Pobjoy Mint from 1983 to 1989. Nobles are legal tender but they do not have a fixed face value; instead, like the gold Krugerrand, they are legal tender to the value of their precious metal content.
The obverse shows Queen Elizabeth II with the text Isle of Man and Elizabeth II in capitals. The reverse shows a viking ship with the denomination and the platinum content with the words Platinum fine.
References
Noble (Manx coin) Wikipedia(Text) CC BY-SA