Kaiser-Frazer, Willys-Overland and successor firms offered their dealers & distributors newspaper or print advertising materials prepared by their ad agencies for local-level use. The mat books and sample sheets shown are among the many items dealers got to use as a "catalog" for ordering specific sample ads or components (illustrations of cars, logos, slogans, etc) they could assemble into an ad themselves or have their local newspaper to do. Some years had books (like the 1951 model year at KF) others had sheets (which dealers often cut up rather than ordering materials).
CIRCLEKF has several items covering 1946, 1951 and 1953 calendars at present.