Q1 THRU Q12. Q9 - 25c Manufactured.
US Stamps Prices Scott # Q8 - 1913 20c Parcel Post
Q1-12 - 1912-13 Parcel Post Stamps 12v - Mystic Stamp Company
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US Stamp Price Scott Cat. # Q1: 1913 1c Parcel Post
Price of US Stamp Scott #Q12: 1913 US$1.00 Parcel Post
U.S. Parcel Post stamps of 1912–13 - Wikipedia
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