1980 LETTER WRITING 1810a Plate Block of 36 x 15 cents US Postage Stamps

In 1980 the USPS issued these stamps to commemorate National Letter Writing Week, which was held February 24 through March 1, 1980. It was the first time that a sheet of stamps with three sets of vertical pairs was issued by the United States. Each stamp focuses attention on the importance of letter writing, and some are inscribed with such statements as "Letters Preserving Memories" and "Letters Shape Opinions."