Just got this cover from the USA which may be a American edition of X461 although it is printed in the UK it does have the price of 60c printed on it.
USA
UK
It is not unknown for different versions to exist such as X718 "The Jungle Book" which has a version that states it was printed in the UK but on the back cover says Printed in Canada which must apply just to the boards. X719 is the same.
CAN
UK