Looks like white.
Here is a real one up for grabs:
https://forum.seymourduncan.com/forum/the-trading-post/6316785-double-cream-custom-for-sale
I am guessing the 'cream' that is contested refers to a particular Pantone color? Even with pickups described as cream have a lot of variation.
I think its the particular shade, like ups brown, as well as having the word cream in the name with any reasonably close shade.
I also believe that rail humbuckers are exempt? Wilde and Bill Lawrence have been selling double cream l500s for years with no lawsuits.
im no expert though.
Yeah, I don't think it covers single coils or single coil-sized humbuckers, either. Also, I've seen double cream Kiesels when they were using 22 pole pickups.