Chevrolet Vega

(Source: Oldride.com)
The Chevrolet Vega Kammback is rare, just like every other variant of the Vega. This might sound surprising, considering almost two million examples of this model were sold between 1970 and 1977. 
The reason for this is the horrible quality of the Vega. With rusting bodies and terribly engineered engines, Chevrolet's smallest model had a serious impact on the reputation of the brand. The example in the photo above was sold in 1975, when sales were already dropping, as the reliability issues became known. 
Probably the only reason for the people to still buy the Vega was its price. To keep it low, GM developed a unique system of transporting the new cars. By storing them vertically, they could fit 30 instead of 15 vehicles on each rail car. To make this possible, cars were fitted with an option the customer couldn't choose. It was called "Vert-A-Pac" and included modifications to the oil pan, the battery and some other parts to keep fluids from leaking. (Source:autoblog.com)