I now own this pedal – having bought it on ebay

You occasionally see “solid” two or three colour graphics (ie those that cover the whole front of a pedal) and I am pretty sure it was a way to use up surplus shells already painted for other models and/or repaint shells where there had been a painting error of some sort.

I just posted about it on IG

https://www.instagram.com/p/B5VWMbTHv11/

All alternative info gratefully received!