1967 US World Jamboree
Postal Card Cachets

SOSSI Cachet

The SOSSI Journal, March 1969, printed
1967 WORLD JAMBOREE 6¢ AIRMAIL POSTCARD CACHETS by Robert J. Gelwicks

The list contained

An illustrated list of all these, and all subsequentially identified examples are contained in SOSSI's Levy Catalog Listing.