The Bailiwick of Jersey square One Pound coin was issued in circulation in 1981 to mark the bicentenary of the Battle of Jersey. The square pound could not be accepted by vending machines and was not issued after 1981 though it remains in common circulation today.
A Bailiwick of Jersey 1981 cupro-nickel square One Pound coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to £3 GBP.
A Bailiwick of Jersey 1981 cupro-nickel square One Pound coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to £5 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
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It's value would depend on it's age and condition. An uncirculated example of the current issue note would be worth about $20. One from 1963 would be worth $135 or even $500 in uncirculated condition, depending on the signatures.
A modern circulated note, even in crisp condition is worth exactly five pounds in any shop.