Scott O51P4 – U.S. Post Office Department Official Stamp
10¢ Black – Card Proof (1873 Issue)
This listing is for a genuine Scott O51P4 Official stamp card proof, printed for the Post Office Department as part of the 1873 Official Mail series. Card proofs were produced in limited quantities for reference, presentation, and collector sets and were never issued for postal use.
Details:
• Scott #: O51P4
• Issue Year: 1873
• Department: Post Office Department (Official Mail)
• Denomination: 10 Cents
• Color: Black
• Format: Card Proof (direct-to-card printing)
• Gum: None as issued (NGAI)
• Condition: Sharp impression, full margins, clean card stock; typical hinge mark on reverse
These attractive 19th-century proofs are part of the classic Back-of-Book Official issues and remain popular among collectors of U.S. proofs and government departments.
