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Crown is a generic term us Brits use for the Size. A Real Crown was 38 mm so pretty much any coin of this size is called a crown regardless of value. Its also what the royal mint calls them.
Ok I understand
It is an expression from the empire where the sun never sets
I was in the UK repeatedly in the sixties when they still had hapny bits and tripny bits and halfcrowns etc
I once had a girl from Cadburies or she had me she thaught . But that is the place with Humpty Dumpy in its local park .
And the girl wanted me to marry at age 18 before I finished my engineering studies and be an interpretor cause even the I spoke 4 languages