is probably the biggest clue.
Its large chrome bumpers, rounded body, prominent headlights, whitewall tires, and overall design are strongly associated with American cars from the 1950s.
Cars from this period often featured extensive chrome detailing and distinctive body shapes that make them relatively easy to distinguish from vehicles of later decades.
The Clothing Provides Another Clue
The man’s outfit also fits the period.
He is wearing a simple white T-shirt with high-waisted-looking jeans and classic footwear. The hairstyle is another detail that suggests the photograph was intended to represent