Likely 1972-73.

Dark Blue nylon uppers.

White stripes.

Leather heel counter and toe.

Part of Onitsuka Tiger's legendary Mexico 66 line, with an Onitsuka Tiger Marathon upper.

Says Geoff Hollister on page 43 of his book, Out of Nowhere, 

"My doctor, Larry Hilt was complaining to Bowerman that the pavement was beating up his joints while he trained for the Boston Marathon in Tiger Marathons. He handed a pair of shower thongs to Bill and said, "If you can place these between the outsole and the upper, I think I can make it. Bill did just that, and Larry ran the Boston Marathon in that Bowerman prototype.' "

Designed by Bill Bowerman and Jeff Johnson - they each came up with this idea simultaneously but independently of each other, as Phik Knight attests in Shoe Dog:

"... Johnson hired a local cobbler to graft rubber soles from a pair of shower shoes into a pair of Tiger flats. ... Bowerman had just asked me to do the same with his batch of notes a few weeks earlier. Good grief, I thought, one mad genius at a time."