Blue NES Circuit Board
Was doing some cleaning on a recently purchased WWF Wrestlemania for NES and found a blue circuit board inside. I checked another copy and it was green just like all the rest I've ever come across.
Has as anyone ever seen or heard of a blue board before?

Has as anyone ever seen or heard of a blue board before?

Comments
When it rains it pours...
Also, I believe this one is blue because Acclame/LJN manufactured their own licensed carts at some point along with Hi-Tech and another US company (Activision I believe or something like that) so it may be blue because they made their own blue board. However, this look like a Nintendo board so the green CBs must have been in short supply so they had to resort using blue ones. Does it say "Manufactured by Acclaim" or something like that on the back, under the "Do not clean with alcohol" warnings?
Also, it seems to be kind of like Active Enterprises' carts of Action 52. The proto's PCB is blue, the first run's is black and the final run's is green.
I got a Marble Madness ANROM licensed NES BLUE board too. It has the original seal of approval, black and white.
EDIT: Heres a pic
Marble Madness
Wrestlemania
Jackal
Solstice (?)