Identification guide for design numbers on United States stamped envelopes, wrappers, and letter sheets
three and one-half cents
(updated 13 December 2014)
There is only 1 design of an indicium whose face value is three and one-half cents. It is:
authorized nonprofit org.
printed in purple on white paper and diagnostic for Scott #590; or printed in violet on white paper and diagnostic for Scott #U590a
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