Another pristine find!
Congratulations on your new aquisition Alistair! I can see that this one will have a special place in your heart, having memories of a similar model belonging to your aunt many years ago.
Though I still think of 1960's stuff as being quite common, having grown up in the '70s, this particular model must be considerably rarer than its contemporaries, such as the model 65.
Enjoy!
Stephen