Playing Cards - Champion Paper, Hamilton Ohio, circa 1900-1950s?

These playing cards were given to me by my grandmother. Unopened, with the protective case-sleeve, the set is complete with plastic wrapping and stamped, I can only assume they were printed in the early 1900s through 1950s. They were printed at a local paper company in Hamilton, OH.

I'm trying to determine the age of these cards and what they might appraise for. Thoughts?