Domestic Letter Rate: 2¢ per oz.
Postcard Rate: 1¢
Air Mail Rate: 6¢ per oz.
The following postage stamp varieties were first issued by the U.S. in 1921
No new varieties of U.S. commemorative stamps were issued in 1921
No new varieties of U.S. Air Mail stamps were issued in 1921
No new varieties of U.S. Special Delivery stamps were issued in 1921
No new varieties of U.S. Postage Due stamps were issued in 1921
Ordinary issue
Number 543 - 1¢ Washington Experimental rotary perf 10 - EDU: 5/21/21
Number 545 - 1¢ Washington coil waste perf 11 - EDU: 6/25/21
Number 546 - 2¢ Washington coil waste perf 11 - EDU: 5/5/21