G'day, the portrait is similar to that used on low denominations for the first 50 years of her reign.
The dates are the beginning & end of her reign: the latter is also her death.
The lack of further information on the reverse might imply something ...
My guess: I'd say that this was designed for a uniface display,
and that it may have been part of a set:
"Queens of England", "Kings & Queens ..." are possibilities.
Peter in Oz
"the only people who are not confused are those who are not paying attention."