It's my opinion that the theory stating the six super prints are tougher than all other Sovereign 460's is not true. There are a group of 460 subjects that were printed in much larger numbers with Sovereign 460 backs than all the rest and you will see them much more often. But the remainder appear to be relative when tracking this back and if you selected a number of subjects from this group and tracked them, you would see that they don't come to market that often either.
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