US020.18
WNS Member
United States of America
Issuing date
6 April 2018
Theme
Science & Technology
Education
Subject
STEM Education - Science
Width
25.00 mm
Height
40.00 mm
Denomination
Forever
Format
self adhesive miniature sheet of 20 of 4 designs
Perforations
12 x 12
Issuing authority
United States Postal Service
Printer
-