Scott O50P4 – 1873 U.S. Post Office Department Official Stamp 6¢ Black – Card Pr

This listing is for a genuine Scott O50P4 U.S. Official stamp card proof issued for the Post Office Department in 1873. Card proofs were produced in limited quantities for presentation and archival purposes and were never issued for postal use.

Features:

• Scott #: O50P4

• Issue Year: 1873

• Department: Post Office Dept. (Official Mail)

• Denomination: 6 Cents

• Format: Card Proof (printed directly on card stock)

• Color: Black

• Gum: No gum as issued (NGAI)

• Condition: Clean impression, bright paper, strong margins, typical aging on reverse

Additional Notes:

• Card proofs are part of the classic 19th-century Back-of-Book series.
• This type is scarcer than the issued stamp and is collected for its historical production quality.
• Excellent item for collectors of U.S. Officials, proofs, and specialized Scott varieties.