George Washington in 2001

The design was first seen in denomination of 20c mainly in brownish red on Feb. 22, 2001 in three formats: flat panes of 10, and two folded vending booklets of 10. The 20c postage is exactly satisfy the rate for a domestic postcard till 1st July 2001. The stamps were originally issued to share the duties to fit with that postcard rate with remaining 20c self-stick Ring-necked Pheasant stamps in rolls of 100 coil stamps and in panes of 10. With the rate increase on July 1, the stamps were out of date, leaving a usage span less than 4 months.

On June 7th, 2002, four more formats of the 23c green George Washington stamp of 2001 were anounced. The new formats are a water-activated pane of 100, a self-adhesive pane of 10 (convertible, or foldable, booklet format), a self-adhesive vending booklet of 10 and self-adhesive coil of 100.  According to the U.S. Postal Service, only panes of 100 were available for sale as of the June 7 official first day. The other three formats will go on sale at a later date. These four new issues bear the year date of "2002", obviously distinguishes them from green Washington stamps of 2001, which bear a "2001" year date. After the rate hike in June 2002, the 23c rate will satisfy both the domestic additional-ounce rate and the domestic postcard rate.
 

Reference: 20c Washington