The grade & overall condition – An uncirculated silver dollar never used as money will be worth much more than one of the same date and. Hunt is on for rare dollar coin that could get you thousands. In the video below: A rare one dollar coin could be worth thousands. Play Video. David Koch shares his money-saving tips A rare Australian one dollar coin, known as a 'mule', is being sold at auction There are currently five coins across 20 cent, one dollar and fifty cent denominations that could be worth thousands of.