Ah, that I would accept if it wasn't for a number of details.
1. The top/bottom devision line clearly running through the relevant chequer
2. Upon close inspection also the devision between light and dark camo on top chequers.
3. Clearly light belly chequer.
IMHO there can be no doubt that this is a single colour chequer, giving only the impression of a full two colour pattern.
It may simply have been unfinished, or else ... more interesting
Hi Philippe, been a while since our little meeting in Amsterdam!!