Photographic paper stock question. Please help
 

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/c/ja3wcnyy.JPG


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/c/8s1y5478.JPG


Thank you in advance.

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

Another good reference
http://resources.conservation-us.org...16_Messier.pdf

Thanks that's extremely helpful