What was meant, I suspect, was a car in the style of those made between 1950 and 1959. In other words, 1950s’ style. Once car is added, 1950s’ style becomes a compound adjective that modifies car and, as such, needs a hyphen: a 1950s’-style car.
Source
‘Karma Enduro’ ad, Sunday Times (Ingear), 7 September 2008, p. 34
For other errors in the same ad, see:
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