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There was no "Festival of Britain" Florin minted, you possibly refer to the "Festival of Britain" Crown (Five Shillings).
See "What is the value of a 1951 British Crown - Festival of Britain".
Do you mean the Festival of Britain in 1951?
in britten
Britain in 1951.
1951
The Festival of Britain was a national exhibition which opened in London and around Britain in May 1951. The official opening was on May 3.