Original AC-DELCO Duraguard OIL FILTERS Plastic Dealership Service Center Sign. I’m not sure when this is from exactly, but I’m guessing early 1970s to mid-1980s. Material is a thick plastic which is approximately 1/4 thick. 6″ W by 34.5″ H. In good shape, with some minor surface, edge, and corner wear from use and storage (light blemishes, marks, scuffs, scratches, imperfections, stains, discoloration, etc in spots). Thank you for looking and be sure to check out my other listings.