1899 - Detroit Publishing - Private Mailing Card, NP Overprint, Experimental Series, Mammoth Hot Springs
Description
TEXT ON FRONT: MAMMOTH HOT SPRINGS
TEXT ON BACK: PRIVATE MAILING CARD / AUTHORIZED BY ACT OF CONGRESS MAY 19, 1898. / THIS SIDE IS EXCLUSIVELY FOR THE ADDRESS.
Published by: Detroit Publishing Company
Year published: 1899 c.
Type of card: Private Mailing Card
Number of cards: 1 (not posted) - Experimental Series with Northern Pacific Overprint
Note: One of a set of 10 Experimental Series
