The USA Parcel Post stamp depict the KRONPRINZ WILHELM unloading the mail at the quarantine station, New York to the mailboat tender POSTMASTER GENERAL, according the book Norddeutscher Lloyd.
The POSTMASTER GENERAL was built by Robert Palmer & Sons at Noank, Connecticut for the USA Mail.
Launched under the name POSTMASTER GENERAL.
Tonnage 434 gross. Dim. 145 x 31.2 x 8.6ft. (draught)
Speed 14 knots.
Crew 6
1898 Completed.
The foreign mail was unloaded from the mail steamers on arrival at the quarantine station in the Bay of New York from 1897 in tenders.
First the PEEKSKILL was used but after the POSTMASTER GENERAL was completed she took over.
28 February 1918 she was chartered by the US navy from Harbor Steamboat Co. New Rochelle N.Y. (I am not sure they were the owners when built) and placed in commission as USS POSTMASTER GENERAL, on 20 June 1918, at New York
During the rest of World War I and the first several months after the Armistice, she performed mail duty for the patrol forces operating in the New York Harbour area.
May 1919 returned to owners.
Her fate not known.
USA 1912 10c sgP428, scott Q6 (The liner is the KRONPRINZ WILHELM)
Source http://www.history.navy.mil/photos/sh-c ... st-gnl.htm http://www/postalmuseum.si.edu/exhibits ... lboat.html http://www.janmaat.de/kronprinz_wilh.htm
Norddeutscher Lloyd Bremen 1857-1970 by E. Drechsel. Dictionary of American Naval Fighting Ships History.