It would appear that this inlay was printed without the color yellow! However, it is also possible that the color yellow may have faded away, as a function of exposure to a light source.

However, such exposure will normally also fade red, and this does not seem evident in your scan. Gene notes that there is some yellow at the left side, is that really there? Is it a stain (cig burn)?

I'd like to see it, so don't let it leave Las Vegas.

Jim