Identification guide for design numbers on United States stamped envelopes, wrappers, and letter sheets
five and nine-tenths cents

(updated 29 November 2014)

There is only 1 design of an indicium whose face value is five and nine-tenths cents. It is:

5.9 in circle
Auth Nonprofit Org

design U137
 =  Scott #U591 (printed in brown on white paper)

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