All 50c coins minted that year were supposed to display a First Fleet ship and the dates 1788-1988 to acknowledge the bicentenary. But an unknown number of those were wrongly minted.
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I was arrested after trying to pay for petrol with a £20 COIN! Moment cops quiz driver in 'legal tender' row
Rare 50c coin is worth up to 30,000 times its face value - have
50c 1988 Bicentenary Royal Australian Mint Roll - Wynyard Coin Centre – M.R.Roberts - Wynyard Coin Centre
One Of The Rarest': 50c Coin From 1988 Sells For $15,000
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Australian 50 Cent Coins – tagged Australian Bicentenary 1788-1988 – Loose Change Coins
Rare coins: An extremely rare 50c coin worth $15,000 is
Australian Coins & Banknotes Trivia Quizzes
1988 australian coin, Collectables
Royal Canadian Mint
Rare Australian 50c Coin from 1988 worth $15,000
Australian 50c coin could be worth $14,750 after printed with
Check your change now: The 50c coin that could be worth $15,000 after Royal Australian Mint error
Australia 50 Cents KM 99 Prices & Values