Backstory:

My husband used to collect old baseball cards. We would typically buy from a local dealer or at some shows.  However, about 20-25 years ago there was a guy having a yard sale, selling the contents of his recently deceased uncle. We stopped by, bought a cardboard box full of baseball cards and various memorabilia,  didn't really go through the box until we got home.

There were a couple signed balls of players we didn't recognize, but at the bottom of the box there was a ball in a case, ball wrapped in tissue paper, when we opened it, we found an old Brooklyn dodgers ball with autographs of babe ruth and Lou gehrig. 

We did take it to a local event that JSA was at, paid for authentication but they were unable to authenticate on site,  didn't deny or confirm. 

I would like to send to PSA, but also don't want to waste anymore money. Google recommended this forum for opinions, so here I am. 

Details: it does appear on the seam of the ball there is handwritten numbers and letters, looks like maybe JT755a, cant really make out the last letter.