1c-10c Louisiana Purchase
(323-327). Complete set tied by "St. Louis Mo. Exposition Sta. Dec.
1, 1904" duplex datestamps, two stamps also tied by exposition machine
cancel on picture postcard to Belgium, fresh and Very Fine, scarce
postcard with both duplex handstamp and machine cancels used on the last
day of the Exposition (Image) 
1c-10c Louisiana Purchase
(323-327). Complete set, tied by oval "St. Louis Mo." oval handstamps
on registered 2c entire to Malaga, Spain, purple "Registered SEP
5, 1904 Exposition Station St. Louis Mo." four-line datestamp and
matching "R" in circle, New York registry label, New York and receiving
backstamps, fresh and Very Fine, colorful and rare usage (Image)