Apparently the Dominions (Australia, New Zealand, Canada and South
Africa) were allowed to use the uncrowned effigy on their coins,
whereas the colonies and crown dependencies, such as Fiji, Mauritius,
and Jersey, had to use the crowned effigy. However, that is not the
whole story: that situation only existed for part of the 20th century.
The wider picture is more complex. To read about how I first stumbled
on it, click on the link below:
http://www.worldofcoins.eu/forum/index.php/topic,4354.0.html
If you are impatient to get to the meat, to the best conclusion I can
reach, jump straight to the final post in the topic:
http://www.worldofcoins.eu/forum/index.php/topic,4354.msg71184.html#msg71184
For an illustrated history of the crowned and uncrowned portraits and
of which countries used which portraits, starting from QEII and
working backwards, click on the link below:
http://www.worldofcoins.eu/forum/index.php/topic,4364.0.html
Phil.