Yes. 9,778,440 half crown 'Elizabeth II' coins were minted in 1965
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The value of the 1948 half crown ranges between 1 pound and 2.50 pounds.
Mary had imrosioned her step sister in the tower because Mary was a catholic and she had heard that her half sister had consipred to over throw her.(Elizabeth was a protestant)
Elizabeth I was imprisoned in the Tower of London in 1554. This occurred during the reign of her half-sister, Mary I, who suspected her of being involved in plots against her. Elizabeth was held there for several months before being released.
monetary value
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Elizabeth I of England became Queen when both her brother Phillip and her half sister Mary died and she received the crown.
Modified coins have no collector value. Any value would be associated with the jewellery.
The value of a George VI half crown coin will depend upon its condition and how much the seller wants for it. You can expect to pay anything in the region of $1-$30 for this coin at auction.
Bullion value GBP 4.70 on 15th Sept 2014 Source: Numista