An interesting wrinkle in the search..
From The Lost Media Wiki
On YouTube, someone who's been uploading lots of classic TV has uploaded a copy of Evening Primrose in colour, but it doesn't even remotely resemble the amount of consistent colour in the screenshot. My personal guess is that this was created using neural network tools to attempt to recolour the footage after the fact-- done with a non-DVD transfer of the footage, for some reason. Still, extremely interesting to have around.