Photographic paper stock question. Please help

[EYECOLLECTVINTAGE]

I received a bunch of yankee snap shots from someone I have done business with before.

Most of them look like this...

https://sportscardalbum.com/c/42460w4n.JPG (https://sportscardalbum.com/card/42460w4n/n-a)

https://sportscardalbum.com/c/ja3wcnyy.JPG (https://sportscardalbum.com/card/ja3wcnyy/n-a)


I know these are period, as I am comfortable with the photo stock, smell etc.

Now my question is this...

Last batch the photos were 1957, and this batch is as well.

There were 3 5 x 7 enlarged photos that were a bit blurrier but with same kid as the others in it. The back says kodak.

Was this paper around in 1957?



https://sportscardalbum.com/c/3m82v8i5.JPG (https://sportscardalbum.com/card/3m82v8i5/n-a)

https://sportscardalbum.com/c/8s1y5478.JPG (https://sportscardalbum.com/card/8s1y5478/n-a)


Thank you in advance.

[steve B]

Probably 70's -80's for the back printing
http://www.cycleback.com/photoguide/stamps.html

Another good reference
http://resources.conservation-us.org/pmgtopics/2005-volume-eleven/11_16_Messier.pdf

[EYECOLLECTVINTAGE]

Thanks that's extremely helpful