A former UNICEF official said Tuesday he fooled foreign officials for 25 years by marking his travel documents with a fake stamp from the "Sovereign Republic of Amnesia."

The phony but official-looking stamp, made to order in Singapore, was most useful in avoiding the inoculations often required by foreign countries, said Tarzie Vittachi in the September issue of Conde Nast Traveler.Vittachi said his official immunization booklet contained the signatures of the fictitious Dr. Portly Rumbel of the Quarantine Department and was stamped with the seal of the Sovereign Republic of Amnesia.

Only once, in his hometown of Colombo, Sri Lanka, did anyone question the location of Amnesia, he said.

"Oh, it's one of those new African countries in the U.N.," he replied, adding, "next to Benin."