4 "F" Flower Rate Change Stamps and
4 29¢ Flower Stamps
For the first time in USPS history, a rate-change stamp was reissued later in the year with the first-class rate.
Since 1978, the USPS has accompanied a change in rate with a non-denominated stamp on which a letter of the alphabet represents the new denomination. Prepared long in advance, the 'F' stamp was ready and waiting for the 1991 rate change.
Like the 1988 'E' stamp, the subject of this stamp, a single red tulip, was chosen to match the letter 'F.' Printing contracts were awarded to three different companies. The United States Bank Note Corporation was assigned to produce sheet stamps, the BEP printed coils and booklets, and KCS printed booklets.
The first-class rate stamps were printed in three different formats by different companies as well: United States Bank Note Corporation for the sheet, KCS Industries Inc. for the booklet, and Stamp Venturers for the coils. The coil stamp #2525, however, had "slit perforations" or rouletting, giving it an imperforate appearance. In 1992, #2526 was issued with round-hole perforations.