The die that struck your coin is really, really showing its age. While it looks good from a distance, it is not a doubled die. Here is what you should see on a doubled die: First off the date should hold a clue for being a doubled die. How? look at the arrows on this image and see what I'm taling about:
On a doubled die, the 1972 year probably has the most doubled dies, because of what is called master die doubling. This happened on 50% of the coins struck that year from three mints.
While these were caused with the master die that year, they are common that year. So there is no premium for these. But here are what you are looking for on the real doubled dies: CoopHome 1972 DDO 1-8 Die number one: (Very nice doubled die)