Buy Ron's book and study it and the other sources of examples available . Also use this site as a confirmation of your opinion and then address any dissenting opinion as to why that opinion differs from yours is my recommendation. The responsibility upon any purchase is ultimately yours not the members of this site. Education is the best guarantee of a successful purchase.
Lastly in my opinion Joe D, like so many others including Mantle and Ted Williams, is not an investment grade autograph unless on something very rare and unique.
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