File:Flag of Southern Rhodesia (1924–1964).svg

1. It is a photograph taken prior to 1 June 1957; or
2. It was published prior to 1974; or
3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply)
More information.

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• It is an anonymous work or pseudonymous work and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
• It is a collective, audiovisual or photographic work, and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
• It is a sound recording or broadcast and 50 years have passed since the date of its publication
• It is an artistic, literary, or musical work created under the direction of the state or an international organization and 50 years have passed since the date of its publication
• It is another kind of work, and 70 years have passed since the year of death of the author (or last-surviving author)
• It is one of "official texts of enactments, bills prepared for presentation in parliament, official records of judicial proceedings and decisions, other material published in the Gazette, official texts of international conventions, treaties and agreements to which Zimbabwe is a party"

A Zimbabwean work that is in the public domain in Zimbabwe according to this rule is in the public domain in the U.S. only if it was in the public domain in Zimbabwe in 1996, e.g. if it was published before 1946 and no copyright was registered in the U.S. (This is the effect of the Uruguay Round Agreements Act (17 USC 104A) with its critical date of January 1, 1996.)