Some great cards posted.
Greg, that's an incredible story about finding your Grandpa's amazing Polar Bear cards!
Andrew, I love the rainbow of 1920 W516-1 cards. I googled "Save your tablet fronts and win a prize. L.A. Becker"
It was
suspected by at least one collector Ms. Becker was a school teacher who offered this contest to her students, and that the writing has been found only on the ten cards from this series. There may be a many as 7 of each subject.
Is that the same story you have about the cards?