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					Originally Posted by NewEnglandBaseBallist  So $600,000 is definitely too much for one of these? I believe it's the only one known. | 
	
 Depends.  Several PCL N172s are one-of-a kind and presumably go for around $100,000 or a bit more.  There is a price multiplier effect for higher grades but it loses its effect somewhat when the lower grade 1-of-1s are boosted based on their own rarity.