were is this coin from

ok thanks for all your help
if i were to sell it what would be a good price ( i weighed it and it is a half sovereign)

 

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i found a fake half sovereign in a box of farthings, it was a superb copy but the gold plating had worn off the coin therfore making it look like a farthing.

 

how much is the coin worth at a minimum lets say mg 35.