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This is because it is one of the following:

It is a photograph taken prior to 1 June 1957; or
It was published prior to 1974; or
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.

See also Copyright and Crown copyright artistic works.

This work was created or ordered by the State of Israel, and is in the public domain because it satisfies one of the conditions stipulated in Israel's copyright statute from 2007 (translation) regarding the State's copyrights:

It is a statute, regulation, Knesset protocol or court decision and therefore ineligible for copyright protection according to §6 of the 2007 statute; OR
It was created more than 50 years ago (i.e. before 1 January 1974), and the State's copyright has therefore expired according to §§42–43 of the 2007 statute PROVIDING THAT

The State of Israel was the first owner of copyrights on this work; AND
The State did not waive its copyrights in a special contract with the author when this work was created.