Anyone any knowledge? I've scoured the net and found nothing about this coin i have except it was never minted. 
Its a 1966 Half sovereign in mint condition in its own display. Can anyone through anything in to help?
EDIT ignore, i've found out why. It's a bloody full sovereign.

Its a 1966 Half sovereign in mint condition in its own display. Can anyone through anything in to help?
EDIT ignore, i've found out why. It's a bloody full sovereign.
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(sorry, had to)