The 1959 10th World Jamboree regular semi-postal stamps were overprinted to mark the 1961 Jamboree. The stamps were issued on opening day, May 2, 1961. Two paper types were used to print the original stamps. Individual stamps were printed on yellow-tinted paper while tete-beche sheets were printed on white paper. Both types were overprinted and surcharged.
a) Yellow-tinted Paper
b) White Paper
First Day of Issue Cancellation
First Day Covers
(Not in author's collection)