[Arran]

I'm not sure exactly, I currently have three "Hippo" models, all Canadian versions, two white and one brown, and I didn't really notice the gold around the rim of the knobs. It's possible that either the white or the brown versions had the gold rings, but not the other, or the paint just wears off with use or maybe got washed away if someone wiped them down. Some of the knobs look like more of a Burgundy colour then brown, it should be mentioned that the 46-1201 and variants also used similar style knobs.
Regards
Arran