Womens Vintage Waffle Trainers 1974 ? Blue with Color changing Swoosh (pics)

Any info on these would be appreciated.

They have a patent number on sole that indicates 1974 I think.

Are these Waffle Trainers?

What do you call the color changing Swoosh?

Do they have any value?

The Waffle soles are very stiff and brittle from age, but otherwise in pretty good condition.

Thanks for any details you can give !

Do they have any other identifying numbers? Try calling up Nike with those and see if you can get any info.

So I can just call Nike and ask about these old shoes ?

Whats the number ?