A rare Ferrari promotional 'Valontan' rotating speed calculator, produced as a period giveaway to Ferrari customers. The circular slide-rule device enables the user to calculate average speed by aligning elapsed time with distance travelled, with instructions printed to the reverse.

Produced in conjunction with Valontan, the Milan-based anti-travel sickness remedy, the reverse is printed "Per viaggiare svelto e sano: la Ferrari e il Valontan" ("For fast and healthy travel: Ferrari and Valontan"), and "Omaggio della Casa Ferrari" ("A gift from Ferrari").

Very good condition.