Just because a wine is old doesnt mean its worth anything, or even drinkable. For the most part, only very specific old wines have any value, and they are from Bordeaux or Burgundy (or a couple of other regions) and have been properly stored for their entire lifetimes. I suggest you either enjoy these Spanish bottles as sculptural objects, or take a chance and break out the wine, which may or may not be drinkable at this point, or put them on eBay as "collectible bottles" and see what the market brings.
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