On March 13, United State Post issued a  Single 33¢ self-adhesive stamp depicting flag over chalkboard. The stamp is printed in pane of 18 to fit the ATM format, the Scott number is 3283.

Issue:                          Classroom Flag 
Denomination & Type of Issue:   33-cent Definitive (ATM)
Format:                         Self-adhesive Sheetlet of 18 (1 design)
Series:                         N/A
Issue Date & City:              March 13, 1999,  Cleveland, OH  44101
Illustrator:                    Hiro Kimura, Brooklyn, NY
Designer:                       Richard Sheaff, Scottsdale, AZ
Engraver:                       North American Roto Engravers, Inc.
Art Director:                   Richard Sheaff, Scottsdale, AZ
Typographer:                    Richard Sheaff, Scottsdale, AZ
Manufacturing Process:          Gravure
Printer:                        Avery Dennison (AVR)
Printed at:                     AVR, Clinton, SC
Press Type:                     Dia Nippon Kiko 
Print Quantity:                 306 million stamps
Paper Type:                     Untagged Type III
Gum Type:                       Self-adhesive
Processed at:                   AVR, Clinton, SC
Colors (PMS Colors):            Yellow, Magenta, Cyan, Black, Red, Black
Stamp Orientation:              Vertical
Image Area:                     16.16 x 20.815 mm
Overall Size:                   22.098 x 24.942 mm
Full Pane Size:                 66.294 x 165.10 mm
Plate Size:                     540 stamps per revolution
Plate Numbers:                  “V” followed by six (6) single digits
Marginal Markings:              “© USPS 1998” * Plate Numbers * 
                                 Peel here to fold * 
                                 Self-adhesive stamps * DO NOT WET