Improvements were made to the original design and new models were introduced. The 1948 Vespa 125 had rear suspension and a bigger engine. The headlamp was moved up to the handlebars in 1953 and had more engine power and a restyled rear fairing. A cheaper spartan version was also available. One of the best-loved models was the Vespa 150 GS introduced in 1955 with a 150 cc engine, a long saddle, and the faired handlebar-headlamp unit. Then came the 50 cc of 1963, and in 1968 Vespa 125 Primavera became one of the most durable of all.