Wow, they had brick schools way back then ??
Nice try, I have hunted my old school in Detroit, amazingly still standing and used.
Problem is, back then and now our play field was hard packed gravel, not very good odds of anything getting buried there. They put in a woodchip playground in half of our old field, well after my school days.
We used to play "Kill the man with the hat" in that field, a variation of "pom-pom" where we'd have around 20 kids or so, we'd throw a hat up in the air, whoever caught it got slammed to the ground after trying to evade capture for as long as possible. You would think no one would want to catch it but we fought each other for the hat just for the right to get slammed to the ground. I imagine some things got lost, I'm guessing no one in that rabble had any rings, sure as hell not me.
Meat market, appropriately, is right behind the school.
Parking lot on the other side used to be a play field just like the other one, we mostly played strikeout and tackle football in that one.
Back grassy area I don't remember, looks like it has been there a while, ought to go check it out.