Vintage 1960s pocket oxygen inhaler in original packaging

This is such a fine example of how the mid-century aesthetic even bled into functional packaging for items such as medical equipment. This is an original 1960s oxygen inhaler with original box, zip case and instructions. Interesting, unusual, perfect for collectors or reenactment, set design, and such. 
Dimensions of box approximately 13 x 21 x 4 cm