Choice to wear crowns in royal portraits

I was just wondering: why have some British monarchs choosen to wear their crowns in their portraits on British coins, while others do not? Can someone cast any light on this?
0
Comments
In other words, I don't know if there is some tradition or symbolism behind the wearing of a crown or lack thereof, when it comes to coin portraits.
Monarchs who reigned for a long period often saw changes in the crown on the portraiture. This has more to do with aesthetics than policy. They picked the design that looked best.
And it wasn't always consistent at any given time. Britain's George V, for example, is almost always shown crowned on coins of the dominions and colonies, but is uncrowned on the coins of Great Britain itself. I don't think this fact was supposed to convey any symbolism or secret message, it's just what the coin designers of the day from each of those countries chose to use on their coinages.
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded one DPOTD.
"It is good to be the King!"
Mel Brooks