Identification guide for design numbers on United States stamped envelopes, wrappers, and letter sheets
three and one-tenth cents

(updated 28 November 2014)

There is only 1 design of an indicium whose face value is three and one-tenth cents. It is:

3.1 c
usa authorized nonprofit organization

design U135
 =  Scott #U589 (printed in ultramarine on white paper)

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