I don't know my Germans at all...but I think you are rite that it is a ribbon core. This puppy came in one of my jar buys, it measures a whopping 1.7. I don't really collect these, but during the course of the year have picked up a few and they just sit in my miscell drawer. Pics of the other few I have. Do you collect them?
No, I don't collect only mint. Especialy with germans. People are generally more forgiving of damage with the old handmades. I try to get a good representation of pretty much every marble maker or category. There are some I haven't really gotten serious about yet though.