Clark Candy "How to Play Basketball" cards are extremely difficult to find. When cut out around the white border, they are approximately 4 3/4" x 8 1/2", with the entire box bottom measuring 10 1/2" x 7". They were included on 6-pack boxes of Clark bars. The 1967 American Card Catalog (ACC) by Burdick classifies these basketball cards as R442. The ACC also indicates that three separate sets of 16 cards were produced for basketball, baseball (R441), and football (R443). Currently, the collection includes #'s 5,6,7,8,10,12,13,14,15,and 16.
The challenge had been to narrow the actual date these were produced. 1953 ACC does not include these cards. However, the 1956 ACC version did include them and classified them as R739. The D. L. Clark Company was founded in 1886 in Allegheny, Pennsylvania. It was later sold to Beatrice Foods in 1955. That lead to the initial conclusion that these cards originated in 1953-54. This probably is correct, as a letter was discovered from the D.L. Clark company to the designer of the cards. It was discussed that the company board liked the designed at that the baseball card series roll-out would be in time for baseball season in the summer of 1953. If they held schedule, these basketball series would have originated during 1953-54.
D.L. Clark Company