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| The Brussels International Exhibition |
| The New York World’s Fair |
| Centenary of the First Roman States Stamp |
| Help Save Venice |
Your answer was: Centenary of the First Roman States Stamp. |
Answer: The Centenary of the First Roman States Stamp was the very first souvenir sheet issued by the Vatican. '1st Vatican City Souvenir Sheet' ![]() 1st Vatican City Souvenir Sheet Centenary of the First Roman States Stamp 155a (1952) |