![O78P4 - 1873 12c Official Mail Stamp - Treasury, brown O78P4 - 1873 12c Official Mail Stamp - Treasury, brown](https://cdn11.bigcommerce.com/s-9xwo1raw7u/images/stencil/500x659/products/70303/52633/USA-O78P4__36022.1711054263.jpg?c=1)
1873 12c Official Mail Stamp -Treasury, brown
# O78P3 - 1873 12c Official Mail Stamp -Treasury, brown
$27.50
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.