Police are on the hunt for an online scammer who may have preyed upon more than 300 people in the past year.

Victoria Police is investigating the extensive series of scams which have been conducted on the online buying and selling website Gumtree since June of 2012.

Police say the con artist has pulled off the Gumtree scam about 300 times. Credit:Screengrab

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A Victoria Police spokeswoman said the victims of the con were members of the public based throughout Victoria and across Australia.