Honda Z (Z360, Z600) is a two-door hatchback made from 1970 to 1974.
In certain countries, such as the USA, the Z600 name simply reflected the engine's size of 598 cc (36 cu in). The smaller-engined Honda Z360 was available in Japan (and other markets, such as Australia) with a 354 cc (22 cu in) twin. In the UK they came only in 600 cc form and were called simply 'Honda Z' with no mention of the engine size in the name.
For more information see here.
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