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Mark TThe "Over 300 subjects" back is considered the (SS) Scarce Series. As far as i know, they were printed near the end of the season so they are less likely to be found. Also, to be found it NM/M shape is rare.
I would love to know what % are found with the "Over 300 subjects" back...
Edited to say: I have seen the (SS) back sell for 2-3 X common back.