Eike Korff

Hey there,this is Eike from Germany🤗 I just came home from a Bicycle Trip around the world and on my way I met an archeologist that gave me these marbles.He said he found them during a dig and has many of those.He told me that they could be my financial safety cussion if I sell them. He told me they would be worth up to 2.000$ So now my question is can anybody tell me which kind they are and maybe even estimate how much they are really worth. Thanks in advance and greetings from Germany✌️