While a sovereign technically has value as coinage, they are more often the purvey of collectors. These coins hearken back to days when the coin was in typical circulation and use. Different versions of it exist depending on year and any specially minted versions available.
To a coin collector, an older sovereign is a good find. Mistakes in the minting process make some years of the gold coin even more valuable. Regardless, these coins make a solid start or addition to any collection.