Here's the only orange border I still have, it is Gordon with Waco. He's beside a normal red border Old Mill for contrast purposes.
I still think this... 1- all series 3 cards can be found with a red border; 2- some series 3 cards can be found with both a red border and an orange border.
I suspect some kids threw the orange ones away because they looked funny, or different. I think there were fewer orange ones to start with, and that they were more susceptible to attrition.
I don't know what to think about those yellow borders.
What's in Gordon's left hand? A brush???