A Geelong west couple is $685,000 richer after a lucky mix-up in Saturday night's Tattslotto.

The lucky punter accidentally submitted two entries for the weekend draw and scooped two first division prizes worth $685,381.44, News Ltd reports.

The mystery woman says she has dreamed of winning for many years.

She plans to pay off bills, buy a new car and go on holiday with her winnings.

The winning tickets were bought from Murphy's News Agency in Geelong west.

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