I only have patchy data for this period in the US so if you have access to detailed figures please make sure to get in touch!
From 1960 to 1970, one model dominated car sales in America: the Chevrolet Impala. In 1965 the Impala sold 1,074,925 units, still to this date the highest annual sales volume ever achieved by a single model in the US (Ford Model T figures were production not sales). In fact no other model has managed to sell over 1 million units in a year, and the Impala did it twice, passing the million benchmark again in 1966.
Other very successful models of the period include the Ford Mustang, peaking at 550,000 sales in 1966…
…and the VW Beetle reaching almost 300,000 units in 1960 and peaking at 423,008 in 1968. A total of 5.5 million Beetles were sold in the US over 60 years.
Please get in touch if you have more info!
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