Original oil and gas trade magazine vintage ad for OIL WELL SUPPLY COMPANY of Pittsburgh, PA. Offices were located in New York City, NY, Los Angeles, CA, San Francisco, CA, Tampico and London. Their motto: World's Oldest And Largest Manufacturers Of Oil Field Equipment. Oilwell Imperial Stuffing Box, Model C. Unique 1928 old oilfield petroleum drilling industry equipment magazine advertisement. Nice graphics.