I'm not an expert by any means but I will give it a shot. The white paint I thought designated a demonstrator, I could be wrong. 1568 had a tad more power than a 1468 I believe and I don't get the fascination with them, it was a bad idea then and still is if you ask me. The yellow 4wds I thought were for industrial applications. And for the golden demonstrators they are worth some good money now days. I had an international loving coworker that told me back in the day a lot of farmers didn't want to be seen by the neighbors driving a gold tractor so a lot of them got painted the original colors. He knows of a few locally that way and won't tell anyone about them so he can buy them some day.
Looks like it was a good day for a good show. I like the pics. There isn't a lot of shows here so seeing the pics are great.