Packard Co. file photograph of two 1928 Packard race cars on track at proving grounds. Inscribed on photo back: “Packard Motor Car Co. Proving Grounds 2.5 mile concrete speedway, Utica, Mich., inauguration ceremonies 14 June 1928; Leon Duray, 91-cubic inch front drive Miller special #4, & Norman Batton, #22, coming out of curve at 140-mph.”