Looks like a slat grille.

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“1943 Press Photo American jeep passes workers on a supply route in Italy. This is an original press photo. Italy — An American jeep rolls along the broad supply route in an Italian wilderness that a short time ago was a mere mule-track. Skilled United States engineers literally carved out the road during the battle for Naples, using bulldozers, cranes and Italian laborers to rush through the job.Photo measures 9 x 7.25 inches. Photo is dated 10-12-1943.”