29 August 1958
Tunesia was quite rich and busy to please the philatelic collectors at Expo 58. Different double cancellations can be found.
They even have done a special action on the last day of Expo 58 - see below card with stemp overprinted.
Official Expo 58 cover edited by Campo Rodan
The Official edited cover with logo of the country (edition is not identified)
Large cover with a mixture of the complet set of Belgian stamps combined with the Tunesian stamp
Maximum card with the double set of stamps (Belgium and Tunesia)
Maxicard with the Tunesian Building present at Expo 58 with the mixture of two stamps (Belgium and Tunesia)
On the last day of Expo 58, (19 October 1958), Tunesia made a special action. They overprinted their Tunesian stamp with "EXPO 1958" and left the star logo and the worldmap (left corner) and created a special cancellation based on the standard cancellation used by the official EXPO 58 organisation. They removed the date information. They sold a total of 2000 cards during two hours and this looks to be rarest item (overprinted stamp) with private cancellation of the Expo 58.
The overprinted stamps should be valued a lot, since most of the overprinted stamps were used for the card (see previous). Very rare to be found.