Issue: Chien-Shiung Wu Stamp
Item Number: 480200
Denomination & Type of Issue: First-Class Mail® Forever®
Format: Pane of 20
Series: N/A
Issue Date & City: February 11, 2021, New York, NY 10199
Art Director: Ethel Kessler, Bethesda, MD
Designer: Ethel Kessler, Bethesda, MD
Artist: Kam Mak, Brooklyn, NY
Modeler: Joseph Sheeran
Manufacturing Process: Offset, Microprint
Printer: Ashton Potter (USA) Ltd. (APU)
Press Type: Muller A76
Stamps per Pane: 20
Print Quantity: 18,000,000 stamps
Paper Type: Nonphosphored Type III, Block Tag
Adhesive Type: Pressure-sensitive
Colors: Black, Cyan, Magenta, Yellow
Stamp Orientation: Vertical
Image Area (w x h): 0.84 x 1.42 in./21.336 x 36.068 mm
Overall Size (w x h): 0.98 x 1.56 in./24.892 x 39.624 mm
Full Pane Size (w x h): 5.92 x 7.24 in./150.368 x 183.896 mm
Press Sheet Size (w x h): 11.84 x 21.72 in./ 300.736 x 551.688 mm
Plate Size: 240 stamps per revolution
Plate Number: “P” followed by four (4) single digits in four corners
Marginal Markings:
Front: Plate number in 4 corners
Back: ©2020 USPS • USPS Logo • Two barcodes (480200) • Plate position diagram (6) • Promotional text