Thanks Kris.
And no, they don't have the dusty little contact marks or sparkle like Jabos tend to have.
Considering when I got these, their condition is quite extraordinary. These are some of my first marbles and I bought them before I learned to baby them. Also before I knew about keeping good records to aid in later identification.
I can narrow the possible sources down quite a bit but not far enough to be able to swear they are not modern.
So which one is the quizzical emoticon! -Steph