Set F - Three Brown Panelled balls.
"Standard size, best quality. (lime or orange panelled available at the same price for those who require them)."

This set stayed in the catalogue until 1977 when it became C144. This was the large sized ball in the standard club edition and display editions of the 1970's. All three colours are therefore common. The early sets seem to have groups of two panels, while the newer ones have groups of three. These later ones are a thinner plastic and were prone to breaking in half. The 1949 catalogue has this listed a "two brown panelled balls".