STAMP #: SL67 (2)
MINT/USED: 
TYPE: Set of 2
GRADE: VF
DESCRIPTION: $50 blue, NH. 1 with experimental Hibrite paper & PVA gum, the other with regular paper and dextrine gum. According to Bileski, only 13 of the dextrine gum copies exist. Bileski notes accompanying.
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