Printed in Japan.
This vintage postcard is unused.
A 'Squeaker' postcard is a card that has two pieced that have been sealed together at the edges. Inside there is a squeaker, just like then ones you find in small dog toys. There is also a small hole in the back of the postcard to let air in and out of the squeaker. When you pinch the postcard, it makes a squeaking noise!
I uploaded a little video of a few squeaker postcards here ...