Original oil and gas trade magazine vintage ad for AMERICAN MANGANESE STEEL. COMPANY. Offices were located in Chicago Heights, IL., New Castle, DE., Denver, CO., Oakland and Los Angeles CA. Their motto: FOR THE PARTS THAT WEAR, Made for HOLT and BEST Tractors. The Toughest Steel Known. This unique 1928 old oilfield petroleum industry equipment magazine advertisement would look sensational matted and framed. Approximate size 10 x 13 inches.