Hey Zero, let me give you another opinion on that ball.
When I was a kid we played with marbles and one game we played standing up and in the grass was one where someone threw out a marble and someone else would try to hit it.
If you did hit it you got to keep it if it was the same size.
Some marbles were larger and we called these "Boulders", were more accurate when throwing and were worth more so if you were going after someone's boulder you would have to hit it multiple times in a row to capture it.
"Steelies" were marble sized stainless steel bearings and were also worth more and also were a little more accurate when you threw them, and the most prized possession of all was a steelie boulder because they were so rare.
You had to smack this thing a lot to even dream about getting one for your collection, and you had to hope you didn't break a bunch of regular glass marbles in the attempt.
If you did manage to capture one this was a proud moment indeed, and you were happy for a long time after while the previous owner was very sad.
This might be one of those steelie boulders.
I have found about $800 in clad in my time, some relics, older coins, silver coins and way more than my share of silver and gold jewelry, but I have never found one of these.
If I ever did, that would be a proud moment in my career for sure, and you did it on your first trip out.
Congratz newb...good one!