This could become my all-time favorite thread!
You don't see many Polar Bear backs missing frame lines, but there doesn't seem to be much interest in them either.
As for your other question about the back color, it could possibly have been caused when the ink was mixed. Different batches of ink in slightly different colors. I used to mix paint years ago and even just one drop of toner could throw off the final color of a gallon of paint.
Like some of the other T206 backs, some players are hard to find with a Polar Bear back while others seem more common.
Here are two from my collection along with a trade card.
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