An exceptionally unusual Marchal Corindon promotional pocket soap booklet, produced for mechanics and motorists during the mid-1950s. Measuring just 8.5 × 5.5 cm, the booklet contains approximately 20 original 'Sapone Tascabile' (Pocket Soap) sheets, together with an integral 1955 calendar and striking Marchal advertising promoting the Ferrari World Championship-winning Corindon spark plug. Designed to be carried in a pocket or toolbox, the booklet provided disposable soap sheets for cleaning grease and oil from the hands after roadside repairs or workshop maintenance. It retains its original hanging cord and remains complete with its original soap leaves—an exceptionally rare survival, as these practical consumables were almost invariably used and discarded.

Good condition, 8.5 x 5.5 CM.