I remember pumping gas into a 1957 Desoto hardtop car like yours (same colors) that a older lady drove to work every day, that was in 1963. She sold it or traded it in on another Desoto later that year on a black hardtop 1961 with the wedge motor with inline dual quads dual quads
I should have learned more from her on why she liked those big Mopar cars back then, but I didn't