The Knapp Electric Co. was a toy and game manufacturer. It's most popular and long lived game was The Knapp Questioner..
It was made from the 1890's on through the late 40's by David W. and his son David A. Knapp.
After WW2 the Jac. Mar. Company of New Jersey acquired this game and put out their version without the Knapp name on it in the early '50's.
Knapp Electric Toy Car (ca. 1900)
What's it worth? Take a look at this Knapp price guide: sold listings for a value indication.