I think the Webster chips are much smaller, about the size of a nickel, printed on rather thin paper, and have tabs along the edges where they could be punched out from the pages of the book you mentioned (1925).

The chip pictured by Mr. Klein is the size of a regular chip and printed on heavier stock. This one was a part of set of "noiseless chips" made by the Dyment company (1933).

Both types are illustrated in the Seymour catalog, pages 357-358, and 360.

These are the Webster chips that I have: