More nice German handmade marbles, one on left is a latticino core, center open core, not sure about the one on the right, looks more modern and not hand made. Does it have pontils?
The left one is a handmade German latticino core. The middle one is a newer vitro caged cateye with hybrid colors (interesting sort of cornhusk colors, not very common) and the last is a agate marble (cut stone).
Cool. I think I only saw 3 that are likely less than 50 years old. (the magic marker ones and the vitro caged cateye and it could be close to 50 by now too). American Machine Made Marbles is a good book if you care for a recommendation. It won't talk about your german handmades though. There are some other good ones out there too.