STAMP #: 463pv, 463pvi
MINT/USED: 
TYPE: Corner Block Matched Set
GRADE: VF
DESCRIPTION: 15c dull purple, W2B, "Plastic Flow" variety, LF & DF. 2 NH matched sets of corner blocks showing "plastic flow". With good eyesight, bright light and strong magnification traces of plastic flow can be seen, as they are quite faint.
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