Her portrait of Queen Elizabeth II became the image of the new Queen on all British and Commonwealth coinage until decimalisation in 1971. (henry-moore.org)
However it isn't that simple and the ratios don't always work out, possibly due to the advent of decimalisation and also due to the different coatings and shapes used for modern beads. (blog.folksy.com)
It remained in circulation until decimalisation in 1971. (henry-moore.org)