I have noticed a variation in the die/mold of the Three Owls chip, coded PB-PE by Dale Seymour. In the photo below you can see the details of the feathers on the chest, wings and tail are different on the blue and white chips. They are identical on the front and back of each chip. I don't happen to have more of this design to see if these are the only two variations or if there are many. OK, OK some might say I have too much time on my hands. Maybe I can find a hobby.