![O21P4 - 1873 15c Official Mail Stamp - vermilion O21P4 - 1873 15c Official Mail Stamp - vermilion](https://cdn11.bigcommerce.com/s-9xwo1raw7u/images/stencil/500x659/products/84379/64581/USA-O21P4__45361.1711107661.jpg?c=1)
1873 15c Official Mail Stamp -State, green
# O64P4 - 1873 15c Official Mail Stamp -State, green
$7.50 - $12.00
Official Mail Stamps- Missing From Many Collections
Official Mail stamps, also known as departmental stamps, were developed in the 19th century as a means of accounting for postage on mail sent by various federal departments. These are a neat area of philately, and would make a great addition to your U.S. collection.
Official Mail Stamps- Missing From Many Collections
Official Mail stamps, also known as departmental stamps, were developed in the 19th century as a means of accounting for postage on mail sent by various federal departments. These are a neat area of philately, and would make a great addition to your U.S. collection.