MAILBOAT POSTAGE DUE HANDSTAMP; Feb. 1863 unfranked env. (slight crease) to England with a "DETROIT.AM.PKT./21" cds on front and a bold "1/-" h.s. used on transatlantic mail boats and in this instance on the Allan Line Bohemian. The rear with Launceston arrival cds. Cross Reference: UNITED STATES OF AMERICA, GREAT BRITAIN, MARITIME MAIL, TRANSATLANTIC MAIL (Image)