Issued in 1969, this San Marino set celebrates iconic pioneer automobiles from the late 19th century. The L.1 stamp features the 1892 Duryea from the USA, recognized as one of the earliest gasoline-powered vehicles. The L.4 depicts the 1899 Daimler, a German innovation in early motoring. The L.3 showcases the Peugeot "Vis-à-Vis" from 1898, a French classic with a distinctive face-to-face seating arrangement. The L.2 presents the 1895 Panhard & Levassor, a landmark in automotive engineering. Printed in rich tones with precise detailing, this set is a prized thematic collectible for vintage car enthusiasts.