[e6phillips]

There are at least 5 variations of this card:

1. Blue background
2. White background
3. Blue background with overprint from the back of the card in the upper left
4. White background with overprint from the back of the card in the upper left
5. Blue background with white splotch above the “e” in Zuverink with overprint from the back.

There may be other permutations of these variations. The amount of the overprinting varies. All of the 5 varieties I’ve found are common.