View of the St. Clair Tunnel in Port Huron, Michigan. Printed on front: "St. Clair Tunnel, Port Huron, Mich." Printed on back: "Published by Harry H. Hamm, Erie, Pa. Made in U.S.A. H.H. Hamm, Erie, Pa. Made in U.S.A." Handwritten on back: "Look Fannie, this is where we play hide and seek. Max." Card is postmarked July 5, 1920.
