| Type | Supply |
|---|---|
| Brand | United States Postal Service |
Check the listing for details. 450 Black Split-Back Mounts (1-Each of MM501 Through MM509). Condition: New. Listed at 33.95 USD. How to Select the Right Mount for Your Stamp The correct mount size depends on the height of your stamp. If your stamp falls between two sizes, select the larger sized mount. Mounts are Easy to Use To insert your stamp in a split-back mount, locate the split on the black background side.