The first two are Vitro machine made marbles imho.
The second one is a German handmade that eludes a description from me.
@Chad G. will know more about this one for sure.
So metal detecting, snake hunting, marble finding--you are very busy. I love all sorts of this stuff.
No Getula in my area though--Bigger snakes are rare but cool in my area, mostly Garter snakes which I love to see in the yard.
Size always matters.
Marble--On!!