![O40P4 - 1873 10c Official Mail Stamp - ultramarine O40P4 - 1873 10c Official Mail Stamp - ultramarine](https://cdn11.bigcommerce.com/s-9xwo1raw7u/images/stencil/500x659/products/89487/68902/USA-O40P4__80582.1711055009.jpg?c=1)
1873 6c Official Mail Stamp,ultramarine
# O38P4 - 1873 6c Official Mail Stamp - ultramarine
$13.50 - $20.00
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.