I have no idea how many are known Gene. I have one and I know that Bob Krueger has one in much nicer condition. Who else? ... Who knows! Maybe some A.C. chippers will share their finds with us.

BTW: The $20 BR errors belong to Bob Krueger. I thank him for providing me with the scans. Here's another one. Note the two pink inserts facing each other at 5 and 7 o'clock ... plus the transposed blue and green inserts at 8 o'clock.