Merit Bodies
Additional information, scans and photos courtesy Alan Schwartz, Joe Lupo and Don Siegel
Merit was a British company that manufactured static model kits of older (1940s and 50s) race cars that were easily adapted as slot car bodies. These model kits were enjoyed a long production run starting in 1956 or 57, and going on continuously until the early 1970s.
Here are some 1963 Auto World catalog illustrations of the various model kits they produced: